Do you think a parent on drugs should have unsupervised visitation?

I am married (soon to be divorced) and my husband chose another women and crack over his family. We have two wonderful boys and they know what's been going on. He told this tramp that I was making him unhappy and I caused him to relaps (start using again). I don't understasnd how I put the drugs in his pipe4, up to his lips, lit it for him and forced him to smoke. It is also my understanding that you have to be happy within yourself before you can be happy with anyone else. I think what it all boils down to is that she is thinking maybe he'll change; however I have been putting up with is crap for 141/2 years total. We were married before and got a divorce then got remarried 71/2 years later. What was I thinking about other than I LOVE HIM?? No point in staying in a marriage by your self!!! What would you do if you were in my position? Our boys are 14 and 11.