Confused

At 10:30 last night I get a text from someone i haven't talked to in almost a year. All the text says is "yo." It took me until 6:00 this morning to figure out what I was going to say back to him. Then i realized that hes the one who messaged me so if I want to know the real reason he texted me I should just take a page out of his book and reply with "yo" as well. And god let me tell you i hated it, absolutely hated it. I have liked this guy for almost three years now and all i can reply with is yo. I think its because deep down inside i know we can never be together again. And its the thought that i want him so badly that kills me because i know that could never happen for us. I really do love him and despite what anyone has to say about it hes the only guy i have ever felt a real spark with. I know anyone who reads this will judge me for what im about to say but im going to say it anyways so you get the idea of why im so attached. I lost my virginity to him when i was 13, I later found out that he was cheating on me several times throughout our relationship. But that didnt stop me because i went out with him for a year and a half after that. Regradless of all the shitty things he did to me I still found hope for him as if he was going to become a better guy from all of it. He started getting into drugs and drinking, I told him to stop or id break up with him. He didnt want to do either of those things though, so he lied to my face about it instead. I don't know what it is about him but i love him, i really do. I have been trying to get over him for 365 days now and having him message me last night has made me realize how much i miss him. He hasnt replied to my text and im just scared for when he does because i know that all he wants me for now is sex. I wish he knew that i love him still, but at the same time if he knew it wouldnt change anything for us. It is what it is and god do i hope i get over him soon because my heart breaks every time i see him.