Okay boys tell me what is going on with this guy cus its confusing me soo much!?

i used to go out with this other guy and a year after we broke up i started to go out with his best friend. we didnt plan on it happenin, but we had just liked eachother and got on so well. so we started to sort of go out, but to be fair he was texting one or two girls, and i texted a few other lads aswell. it wasnt serious i suppose but for about four months we started going out to the cinema and stuff and he always told me how much he liked me. things were going great until one day he suddenly stopped talking and texting me. it was like he virtually disappeared. so then i thought fine, he doesnt like me anymore, its his loss. and i got on with my life.after three months of no talking, i saw him on a night out. i walked past him like i didnt know him and he pulled me back and started apologizin for stopping talkin to me. he told me that he still liked me and thought about me all the time. i asked why did he just stop talkin to me and he couldnt explain himself. he said stupid things about having exams but i knew he was lying because my friend does his course at uni too, and plus i just always could tell when he was lying. so anyway, we talked all that night and i admitted i still really liked him despite the whole ignoring me thing. we just got on so well like it was old times. i text him the next day sayin i was glad it wasnt awkward between us anymore but i never got a reply.so after a week of hearin nothing i was like wdf? we didnt speak for another month until i heard from a male friend of his that he was going with another girl now, but he still liked me. and then one day i heard from a girl who was his friend that he had no interest in me whatsoever...... please explain what is going on in this lad's head....i know he isnt worth me caring about, but the fact is, if he came back to me and apologized again, id go straight back to him. i actually hate that i really care for him but i cant help it :(