Sadly, he knows that the right thing to do is to try and make a go of it with his child's Mum. Also sadly, a young man like this is not going to turn down the opportunity to have sex with a girl. You will interpret him having sex with you as him liking you enough to even have sex with you. Not so, sex to most men is just sex. To you, it involves feelings and emotions. That's the big barrier between men and women- we are poles apart in this. For the sake of the child, leave him alone now and let him get on with his relationship. Plus, if he gave your number to a friend who wanted sex, sorry, but he clearly thinks you are "easy". If you really like someone and want to have a relationship with them, try NOT having sex with them. make them work a bit harder, prove they like you enough to stay with you without sex. If all you have to offer is sex, that is all they will want, and all you will get.