Feelings for my ex, Help plz :( Options

[EmoEyelinerx]

Me and my boyfriend (lets just call him "M") had a great relationship; we always hugged and kissed in-between classes and everything and he was in a few of my classes. Then one night i was talking to M about something -i dont remember what it was- and it lead to us talking about what we have done with other people (kissing/touching that kind of stuff) and at first i wouldent tell him becuase i thought he would get upset with me and well thats what he did becuase i WOULDENT tell him. Then later that night i told him what i did with other guys and he was still a little upset because i wouldent tell him earlier and he said "i dont think i can trust you" and he told me he wanted to break up "for the better." So we did and the next day (saturday) we were talking and we got back together and i said i was sorry and everything. Now we broke up again because my stupid frined told some girl who everyone knows cant be trusted with a secret that i kind of liked another guy (only like 1%) and now Ms going out with another girl (who no one likes and she flirts with EVERYONE) named "D", shes a total slut and everyone knows it. I talked to him yesterday and told him that i only like the other guy a little and i still loved him (M) and that i still have feelings for him and all he said was "ok" (we were texting). Everytime i see him in the halls or with D or in one of my classes i get really angry and i just feel like crying. I dont know what to do please help