Do you think my ex boyfriend cares for me at all?

okay, well I was with my ex boyfriend for a year and two months. We are eachothers first love and first everything. when we met he was crazy about me and he was super sweet and a great guy. Our relationship was so great. He was always afraid of loosing me and he treated me like a boyfriend should, always letting me know how much I mean to him and complimenting me. He became my bestfriend. It wasn't only a boyfriend and girlfriend thing. I could tell him anything and we could stay on the phone for hours laughing and just being ourselves. then we became sexual, and that I think affected us because instead of being happy to see eachother we went straight to doing sexual things. We always told eachother that on our year anniversary is when we were going to loose our virginitys to eachother so we waited till then. We were always so close we were talking every second of everyday. towards close to our year anniversary he started smoking marijuana a lot. He started being distant and not wanting to talk on the phone or text as much because he was always with his friends and getting high. It seemed like that was all he cared about. I would get upset and tell him I wnated him to stop because I was afraid of him changing and he would always assure me that he wasn't going to change from smoking weed. Well when it came down to our year anniversary we lost our virginitys to eachother. it was very special, three days later I went on vacation and I called him and he was high, so I cried because he seemed like a different person. All he would say is "I got to go, ill call you later" and he never did. He told me he didnt know if he loved me anymore and i was so upset because i had just lost my virginity to him. We were going to break up but we didn't we tried to make things work. we stayed together for like 2 months longer and he was always high and i was always complaining, at school when I saw him i would say "hey baby :)" and try to hug him but he had no emotion what so ever. it was like talking to a wall, all he would say was "hi.." with a plain face. I didnt even know who he was anymore. I got sick of it and broke up with him hopinh we would end up together again. When i started talking to other guys he started to act jealous and he kissed me at school. Then stupid me, assured him that i didnt like the other guys and i didnt let go of him. I never left him alone, i was just so confused on why he changed and i just wanted to go back to what we were. eventually he stopped caring completely and acted like a a** hole to me. He started flirting with other girls like never before. I STILL held on and didnt leave him alone. then one day i just stopped talking to him. I havent talked to him at all for about 5 months now. He is completely obsessed with this girl and wont leave her alone. He keeps asking her out and she keeps turning him down but he wont give up, he even was going to quit smoking marijuana because he wanted to be with her so bad. which makes me feel like a piece of worthless s***. and shes the Complete opposite of me with the looks. :( I want to get over him so bad but im constantlly wondering if hes thinking of me. and im always wanting to click his facebook page, its like im stalking him. I dont want to be this person but this depression is driving me insane. I want him so bad. I dont think he cares for me at all. because he says he doesnt give a f*** about me. We havent talked for about five months and I got sucker punched by this girl randomnly. so he texts me for the first time through this whole break up, to laugh about me getting punched. what should I do? do you think he cares at all?