broken heart..need advice

kk, so last year there was this guy... i REEEAAALLLYYY liked him. we were really good friends and he liked me too. every time i saw him with his girlfriend, it killed me inside. but he NEVER asked me out so finnaly when i got the chance and he was single i did something bold and asked him out. He said yes and sounded really happy. We flirted all the time and things were going great... then the next day he comes to school and is like..."how am i supposed to even like be able to talk to her over the summer? and we are going to different schools next year and she doesnt have a phone" so then after one glorious day that i was the happiest ive ever been, he dumps me. I was so hurt. then we were just friends. But good friends. We talked to each other about everything. Then when the scool year ended i got his number from a friend. when i got a phone that summer, I texted him quite a bit. We had a lot of fun talking, and then he told me he LOVED ME and i said "are u sure ur talking to me?" and he was like "yeah you" and i said "ily too" (because i still wasnt over him) and he said "LOL"..i found out he was just messing with me but it hurt...and it hurt badly...so MONTHS later i texted him and said "hi" and his response was "who the F&*# is this?" and i said "hannah" then he went on to tell me i was f*****g annoying and to get the f**k out of his life. I coulnt beleive this was the same guy. It made me want to cry. I mean, one minute were way good friends the next minute he is a big fat jerk! Hes emo and i dont know if he was just depressed and acting like a jerk, or what. But i am going to hang out with my bffl tomorrow, and i found out he will BE THERE! what the h3ll am i gonna do? and also do you know why he is being like this?