I need advice. Best answer gets 80 points.?

So I'm 18 and my ex just turned 28. We dated for 7 months. He was my first love and the person I gave my virginity to. Everything was perfect at first. We were always together. Then he got on line to pledge phi beta sigma and things started to change. We didn't spend time together and we barely talkd. One day this girl asks me if me and my bf are still together because he was trying to have with her. I asked him about it and he said he was just joking and he sent her a y text. so I just blew it off and told him not to talk to her. He agreed. Time ped and he had a physics quiz to turn in that he didn't do so I offered he told me no because it was already due. so the next day the teacher says u can turn ur quiz n later. He texts the gurl and asks her to do his quiz and said that he wud pay her. The same quiz I askd him if I kud do for him.so I felt disrespected and wen I asked him y he did it he said he was a grown man and he does what he want. So I broke up with him. 4 months go by and we act like wer still togethee but we fight alot and he always says u broke up with me. So I told him I wanted him back but he told me he didn't want a relationship. So we kept acting like wer were togetherI told him ii wanted to talk to him n he was like okay tomorrow at 11 so that day ii got up n was dressed by 11.. So ii was like wer u wana met.. yo house? he was lik no ii dont wana b here I'm kumn to campus . I was like aint no where private we can talk on campus . He didn't text me back so a hour later ii called n he was like he was helpn hys dad wit a door so ii was ok u kuda told me that instead of having me wait.. Another hour later ii call him already mad because he had me waiting for two hours n we got to arguing. So he was like meet me on the plot n five minutes den we gon argue in front of everybody.. The festival was that dayso ii went to get him from the plot.. He out der with blue n white sigma everything on! We argured & I told him I wished he wud die.