Im sorry I dont quite understand your post.
How has he got himself screwed? How has he
been screwed over? He is as responsible as she is for the position they are both
are in. Poor him. He had unprotected sex and now this girl is hassling him for commitment and finances. *eyeroll*. OK.
Why is it always the first assumption that this girl might be sleeping around with other men? Couldn't it be possible that she is telling him the truth. I would assume he is the father until proven otherwise.