We dont talk anymore- am I in love or just obsessed?

We havent talked in a long time (6-8 months?) And my lifes been hell ever since.. Ive known him for almost 6 years now and I feel like I fell in love with him the first time we met. Everything was perfect between us, we talked and hung out everyday. We were both so happy. Everyone always joked and said we were soul mates and meant to be together and that we made a cute couple. So I finally told him how i felt, he said he also liked me since that first day and that im beautiful to him. But after that things got awkward between us and he started ignoring me. We've talked a few times since then but it was never the same. This whole time we havent been talking has been really hard for me to deal with. Ive tried dating other guys to get him off my mind but they just didnt feel right, and I always end up comparing them to him. Hes on my mind 24/7, I stay up every night crying because I miss him so much. I miss everything about him. His smell, smile, voice, the way we hugged longer than a normal hug... Everything! Ive started drinking, cutting and doing drugs because I feel like a part of me is missing without him in my life. Nothing seems correct anymore, and I dont blame him for any of it, its my fault for telling him in the first place. I just feel so lost... Is this love? I know hes been affected by this too. He never comes out of his room, he doesnt talk or eat anymore... (his sis is my best friend and she keeps me posted. ALSO im 16 and hes 15, I dont know if age has anything to do with it)