What if I really want to break up with him ? He's been going through so much, but I can't take it anymore.?

I've been with my boyfriend for about 1 and some change. We met my first year of college (i'm a sophomore now). He was known to be a big player, but he came to me so many times trying to tell me about his past, so that I wouldn't look at him like he was crazy. Over the course of our relationship, everything seemed to go smooth until I got this weird gut feeling that he was cheating/talking to other people. And, I know. You're NOT supposed to check someone's facebook or phone, but I did that and found out that he told one girl that he loved her and he lied to me about the age and relationship status of another girl (he told me that she was 28 married with kids, then 26 with a boyfriend) and when I found out on facebook, she was really 21.

(We're living long distance too) So, I can't never help but think about what he's been doing etc. And it's tormenting me, and it has been since the summer. Right before I went back to school, we broke up because he felt like I had 'issues" to deal with since he called himself trying to regain my trust after only 3 months. And foolishly, I tried to make him see why I was the right person for him to be with. But, he was being so mean and said things like he didn't have time for me. And that's when I realized that I couldn't deal with that, so I deleted him from my facebook list and blocked him. Until he contacted me like about the 4th week into the semester. He came back talking about he didn't know what happened to me, he was worried, and how he doesn't want me to be with anyone else. And I fell for that. So we got back together. October, we celebrated our first year anniversary together. Basically, I had more of a set plan than he did. He gave me flowers and took me to an arcade. I cooked food, we went out to eat the next morning and I paid, and when were being intimate, I made the place look really nice...candles and stuff (because I just like candles) lol.

And I've just been having these same tormented feelings, like I don't want to be with him at all. And he's been going through so much with his family, so I feel like me bringing this up would be a bad time. He always guilt trips me into staying with him, like "So you're going to give up the memories, the good times, can't nobody love you like I do." AND THAT CRAP gets annoying!

It's like if you think we've had good memories, it's mainly because I've made them. I basically did all the work in the relationship, while he was around lollygagging. And he even had the nerve to say that he's irreplaceable. REALLY?

I'm just trying to figure out a good time to break it off for good. This is finals week, and I don't want to do that to ruin my concentration. And, next month I am off for break, but I will be back on campus. And that's going to be hella depressing lol. What should I do?