i'm kind of curious why you took him back? we aren't talking red flags here that indicate something is wrong.....you have facts right in front of you that along with his out of control drug use, he is also out of control regarding casual, risky sex and constant seeking of attention from other women. which is still ONGOING.
what concerns me is you are still buying the lines of bull he is feeding you. this is not a changed man, nor a remorseful man. he's probably counting his lucky stars that you let him come home, and he can try and play this off and not get kicked to the curb.
is he damaged from the drug use. heck yes. and boo hoo to poor stupid him. i tell you straight up right now - he is NEVER going to be a pre-anything. and he's never going to be the type and quality of man you deserve. he hasn't been for a long long time.