Is it still worth it? Should I give up now?

[This girl]

Last year, I confronted my bf that we never hang out outside of school & we made plans that weekend. When the weekend came, he forgot & was free the whole weekend. A few days ago we got in a fight bc its basic chivalry to pay for everything on a date when you bring a girl out. He said stuff like I don't have a lot of money & im not rich. I understand him but I've been lonely in this relationship that I ever was single. We broke up & I miss him. He does all that relationship crap with me but he doesn't want to commit. Its bc I hurt him by breaking up but he doesn't understand that if we're dating he can't neglect me. Yesterday morning at school we made out two times & he told me I love you.. I was kinda happy... But last night on twitter, I saw him talking to another girl & winking. I was upset bc he led me on. I have a twitter account where i tweet quotes & i was tweeting break up song lyrics. He posted on twitter saying tht its his pet peeve tht i have over reactions. Then he was stupid enough to retweet a tweet basically saying "he ejecuated loads while watching beyonces performance at the super bowl. I had a stroke last night after reading all his tweets. I don't know what to do anymore. I miss him & i wish we didnt break up, ,but im afraid hes starting to like other girls even though he said in the past that im the only girl for him. Honestly i get jealous whenever he talks to other girls bc he once cheated on me. Im heartbroken.
We were almost 3 years