I basically told him that I used him for sex the other day. Yeah I kinda did, but he was very very very persistent and wasn't taking no for an answer. I should have stuck to my guns and pulled out the "break up with her" line on that day. I didn't think to say that until the next day (or was it later that night? I can't remember).
I feel like pulling out the line..."Look, I was turned on. You turn me on. Would it make a difference if I used u for s*x or if I had s*x with a different guy?" Maybe that's a tad unfair...the truth is I wouldn't have s*x with anyone else at this point. I wouldn't bring another man around d for a start. I wouldn't feel comfortable to be that intimate with another man w/o a decent background first.
I think I just need to say to him. Look...either you want to give this a go in which case you'll break up with her. I will not talk relationship stuff or ML with you until you prove that she (and previous g/f) are out of the picture.