You will eventually be at peace with it and move on, he is manipulating you I think – he wont change until he is ready to. Coke makes people evil, you could spend the rest of your life worrying, once trust is gone, its gone.
Go out, date, have fun, someone else will walk into your life and sweep you off of your feet.
There is no point trying to help someone, who doesnt want to be helped. xx