Your right. At first he was a great guy. Then he changed. All because of drugs. I am afraid that if he gets any custody he will try to kidnap her or something horrible. I am not asking for you to judge me for the mistakes that I made. I understand that getting involved with him was a bad choice. I am only asking because I care about my daughter. He only wants to see her to get to me. If he would have stayed on the right path. We would still be together. He chose everything else than a family.
Honestly, I'm not judging you. In fact, you are one of the few people who answer a question honestly - I can truly feel your pain.
If you read through the questions you'll see that every man claims the mother is a major nut case; every woman claims he's abusive and should (or is) be in jail.
I do understand that you tried to help him straighten out, and it sounds like it might have worked.
At any rate make sure you have notes and records and copies of everything. IF he moves for visitation or custody then you have to PROVE he's a danger to the child (mentally or physically).
I would definitely ask - if he files for custody or visitation - ask for supervised visitation (in the presence of a neutral party).
Good luck - sounds like a nightmare.