My boyfriend and I were together for over 2 1/2 years, but only actually in the same state for the first half of the relationship since he joined the Marines. Well, he was discharged for medical reasons and is now living in New Jersey (I'm in Michigan) with a friend because his family is crazy and he doesn't think he can deal with them. I thought everything was going great because we were talking all the time and laughing together just as much as ever, but then one day he calls me and tells me he kissed another girl. He feels terrible about it, tells me it doesn't mean anything, promises to never do it again because he was just confused and doesn't know why he did it. We talk and I end up forgiving him because we haven't seen each other in several months, he told me about it, and it wasn't like he slept with her. The next month he calls me up sounding like he lost his best friend and tells me that he must be out to do himself in because he kissed another girl and doesn't know why because he claims to still love me. We "separate" with the idea for him to get his life in order because it really is a confusing time for him because he's only 20, doesn't have a permanent place to live, can't afford to go to school, just got a job so that, he says, he can afford to come back and live in Michigan, and he doesn't really know where he's going in life. That was about two months ago and for the past couple weeks, we've been talking and I thought working things out. He knew that he was going to have to earn my trust back and I knew that I was going to have to be patient and get over the fact that I couldn't see him in person yet. Well, today he calls me up and tells me that he has been seeing another girl for the past week and didn't tell me because he can't stand calling me anymore because I don't trust him and remind him of how he screws up all the time. Needless to say, this comes as a shock to me (even though, I know, it shouldn't) and in the middle of his claiming he doesn't know what he's doing, I ask him how it works that he can claim to love me and yet refuse to stop seeing this other girl. He wants to keep talking to me and tells me he still loves me and to please just understand. What I understand is that I don't think he truly loves me anymore because how can he if he is seeing another girl? I still love him (though, obviously, I don't like him right now) and that just makes it all the harder for me right now. What should I do? Intellectually, I know that I should just stop talking to him and let him do whatever, ignoring his pleas to the contrary, but I still love him and don't want to just throw away 2 1/2 years on something that may be temporary. I know I sound foolish and that the answer should be simple, but for me, I guess it's not. So, what do I do?
He cant keeping cheating and get away with it by claiming to "be confused"- move on- find a guy that will appreciate you. Stop torturing yourself- I know you dont want to throw away 2+ years, but obviously he doesnt feel the same way- he tossed it all away when he kissed that girl.
Eek!
I know you've probably decided what to do by now. But listen to me, darlin', I was in a dysfunctional relationship similar to that with my ex-fiancee, we were living separately (different state) for at least our last year "together."
I was with this guy for 4 years, and almost 1 year being engaged when I found out he's 1) cheating on me 2) using the money I loaned him to take out his other gf. So yes. I almost didn't want to break it off with him because I've put in so many years, so many tears, hard work to make things work between us. Even upon finding those out, it was so difficult to erase my dream wedding, my dream family, etc. It's just so bad when you had this vision of you, being together, overcoming obstacles, being happy finally after years of HARD work of making it work.
It took months of push and pull between me and my family (they were supportive of me regardless what I did, and they wanted me the most to be happy). It's crazy, I tried to avoid breaking it off, but he was just making things more miserable between us. He would charm me one day with the "I love you"s then the next day completely dismiss me for his other 'gf.'
My suggestion, like any other sane posters, is to break it off with this man.
Now, believe it or not, based on my experience, since you're actually apart (long distance), it's EASIER to break it off. What I did to my ex-, was at first, distance communication, in the
beginning, I was always calling him sometimes twice a day (well, it was a daily basis thing). Then, I decided to QUIT calling/e-mailing. He didn't contact me, not until a week later, then
when he spoke to me, I kept distance still, keeping things very casual/general, no lovey-dovey stuff, it was all about his school and my work.
It went on for at least another month, before he finally realized that he was losing me (and my interest in him--I'm sure he's probably surprised because he always knew I was the one who
always chased him) then he started to contact me as often as he could.
During this next phase, I stayed at my parents, who intercepted his calls and followed my direction (I didn't want to talk to him mostly).
Another month passed then I actually e-mailed him the break-up e-mail. He never replied. All I knew was, he took my laptop that he borrowed, never returned the money I loaned him for school
(I was working to help support his education), and gave our bike (we bought a bike together) to his friend. 
So I'm not sorry that I broke it off like that. I offered his ring back (in hope that I could get him to return some of the money he borrowed from me), but yeah, he didn't respond.
The last I heard, he hightailed it back to his parents's.
So yeah, it's actually easier to break up when you're in a long distance relationship. The key is to avoid temptation of calling him or receiving his call or replying his e-mail or chatting with him.
Do you have good support system you can turn to, warn them that it'll take you a while (a long while) to get rid off him off your system. I realized eventually I was not in love with my ex
anymore, but he was some sort of addiction, therefore it took me awhile for rehabilitation. 
But it worked though. It should too, and you know what, you deserve so much better too! Believe me. You do!
GET RID OF THIS GUY. he sounds like a total player and a liar. you deserve faithfulness and someone who you can trust. not lies and games like that. it's just not good for you.