What should i do about my ex?

Ok sooo I'm 16 and I dated this guy for 5 months, totally in love and then one week everything went wrong: I got in a fight with my best friend, quit the cheer team at school, stuff with my dad and I'm just thinking the worst absolute WORST thing that could happen is if I lost *tim. So of course friday come and I got to a lecrae concert with my church and I tell *tim I couldn't text him that night and he was going to a party anyway(ps *tim is 15 and parties and doesn't invite me with him) and so saturday comes and he hasn't texted me all day. 7 pm comes and I text him hey and then he's acting strange withe the whole add a period to your responses thing and I'm like what's wrong and then he told me he cheated on me. Wow I didn't expect it. I started crying and he was yelling at me to break up with him and I told him I couldn't, I know he made a mistake but I was willing to forget and move on. But he obviously didn't want to. So I ask if I can call and talk about it rather than text and he said no, only if I was going to break up with him and he didn't want to hear me cry. So we talk and I'm trying to convince him it'll al be ok. Then he tells me he wants a break because he needs to figure things out. And so I say fine and he's like I still love you. Bs.. Anyway by the time monday comes everyone at school is talkin about it even teachers.. And just its horrible, then a week later on the day that was going to be our 6 months he texts me telling me he realllllllly likes my friend(yeah my FRIEND) and kissed he 3 times at school and he doesn't know if she feels the same or is trying to just make him happy and not hurt his feelings. I tell him idk and I'm mad cuz uhm hello she's my freaking friend! And then I couldn't take it cuz I missed him so much so I told him I wanted to be friends cuz I couldn't keep goinng thru this pain anymore and then he got really mad and ignored me for 2 days. Let's jump to a month later: its like a cycle, he flirts, he ignores, he acts like a friend, then start all over again. But this time it was worse. He texted me allllll upset that he didn't see this girl he wanted to ask out on a date. I said I'm sorry and thought to myself why are you telling me this? You know I still like you.. And then the weekend comes and I hang with my guy friend *tom and when I leave to go home *tom kisses me. I go home and cry. Then I tell my friend *ashley and she tells EVERYONE. The next day I got *tim and his friend *jake texting me calling me worthless piece of **** and making me feel like a horrible person. I did nothing wrongg!! Idk why *tim should give a crap when he CHEATED on me. 2 days later I give it to him sttraight that he had no right to to that to me and he said he didn't know why he did that and he's sorry(oh yeah*tim also started doing drugs again) and then the next few days he's flirting with me like crazy as if he's going to try and get back with me. He keeps playin games with me and I can't take it. Then my phone service is cut off cuz I got in trouble and I wasn't able to talk to him for 4 days. Whn it turns back on he's acting like he did before, all pissy. So yeaterday he completly ignored me and I wasn't feeling good so it was a bad day and (he texts me first all the time by the way) then after school he texts me asking me why I looked sad and I told him and he never replied. Then this morning I saw him and waved and he just nodded his head. So can someone please just helpo me? I don't know what's going thru his mind and I hate feeling like everythings my fault and I'm worthless:/ I want to be happy again and I wanna move on cuz obviously he doesn't care, or he just likes to watch me suffer I really don't know but please what can I do about him and for myself? Thank you so much ots much appreciated<3 knicole.