How do i deal with love?

i love my ex- sooo much. he has a drug problem, and thats why i left him. but it confuses me, because he is nice and so sweet to me. but he is better off being a friend. ive tried so hard to help him with programs, and his family told me he never went for a girl before like he did with me, because i asked him to, but the problem is that i dont want him to go because of me, i want him to go because of himself, to better his life. without the drug problem we would be perfect, but this is something serious, we are talking about heroine here, which could equal aids, and so much risky diseases. im not messing up my life because of him, so i left him. he is so indenial of his problem that it makes me mad. but i still love him and he tells me he loves me too. but how can i move on and deal with this problem?

Well, you've taken the first step in the right direction by getting out. The next thing is even harder. Love isn't a switch that you can flip on and off. It lingers. Of course you have strong feelings for him, you love him. But his addiction is dangerous. He will not change until he decides to. You can't make this happen. He has to do in on his own. Alone. You need to focus on you. Go to school, find something you are passionate about and concentrate on that. Volunteer your free time. Join groups with people who are interested in the same things you are interested in. Stay busy, meet new people. Eventually you will find a new place in life for yourself. A good, stable healthy place filled with stable healthy people who care about you. And maybe even fall in love again. It doesn't seem like it right now, I'm sure. But it will happen if you give it a chance.

u can be there as a friend and support him, but next time, find a man who isnt dependant

My marriage broke down because of his drug addiction in which I found out about after marriage.

You have made the right decision in leaving him. He needs to help himself. Drug addicts can be sneaky and calculating, they will do anything to hide their secret.
It is a blessing that you know it now, move on and look after you. It is his problem.
I understand how you can still love him. This is because you choose to remember all the good things.
You must be realistic and look beyond the sweet memories, he will only cause you grief.
Let go and allow him to make serious changes within himself. He needs professionals, not a girlfriend/wife.

Good luck.