Welcome to SR but as always I am sorry for the reasons that brought you here. I am so sorry for your pain and hurt but you have come to a great site for help.
Cynical One has a great blog. There is a lot of great information on crack and crack/sex addiction. I have talked to a girl friend whose husband is addicted to crack and she verifies it all.
I am not trying to make your situation worse. I just think knowledge is power when making our decisions. Less then 3% recover from crack for life. Less then 10% of addicts recover for life. Addiction is just that powerful.
Keep posting and reading, it is very helpful!! Also, Codependent No More is a great book to learn more about YOU!