Honestly, you guys keep talking about them being young, his girl being a cokehead/bulemic, him being depressed, him being a TPWF, etc etc, and I don't think any of those are the main problem.
The main problem here is that like a week ago she ADMITTED to you that she was feelin this other dude she was chillin with. You're not the least bit worried this might not be your seed? Seriously son?