Yeah, it's really easy to fall into these kinds of "lapses". But I think you can never really say you are over an ex until you can imagine seeing him with another girl and not be jealous. It wasn't until very recently that I have been able to do that. I thought that just because I wasn't hurting or crying anymore, and that I was able to get on w/ my normal daily routine instead of moping around, that I was over him. Then little things like seeing other girls' names in his cellphone addy book, or even just the thought of him going to mixers this fall would make me jealous and get me down all over again. But at least, as time passes by, everytime this happens, I am able to get over it quicker than the last time, and become stronger.
My ex is currently on vacation visiting this family his family is friends w/. The daughter of that family and him, had some sort of fling or whatever way back, and before he left I thought of the two of them hanging out (w/ the possibility that something might even happen)in the whole 2 weeks and i got jealous, sad, and even dwelt on it in such a pathetic way...I would be looking in my watch the day he left and ask my friend "you know the two of them are making out right now probably" or something like that....but as the days wore on, without seeing or talking to him, and with only myself, I am able to think that even though I miss him and grateful for what we shared, there is still life ahead and that Hootie is right, better things are waiting for us. I do wish that he has a good time over there in vacation but I can think now that he and that girl might have hooked up and it doesn't matter to me anymore. He and I are over, and so what if they hook up? I know that whatever happens, I'll always be his friend, and i just wish for his happiness. Lana, I think that unless you and your ex would be able to keep a mature platonic friendly conversation, I would advise against talking to him because in the state you are right now, you don't want emotions to take over while u talk to him. Give it time...and so what if his fraternity is doing homecoming with the DZs, and that he might hook up w/ one of them

Hey, your sorority would be doing homecoming w/ a fraternity too!
but what do i do when I was missing my ex? Personally, I avoided listening to sappy love songs because they had that effect of making me cry because I felt that it was written for me...instead I listened to "girl power songs" like Stronger by Britney, He's Got To Go by Destiny's Child, and Let Me Let u Know by Pink. Pain by Dream is a good one too

They totally made me feel better.
I also went back to stuff that I used to like that I never have time for now, like reading, shopping (at least im not hurrying anymore)...and the best one: i busted out my old addy book and gave my out of touch friends a call. And I hung out with my friends and sisters. Times like these, you need good friends to chill with!