@BillRM,
looking at it forensically, beth makes sense. There seems to have been some kind of a determination (because we cannot assume that people are that stupid to just accept the OP's word, "Consequences of hooking up" often lewad to a woman making a decision based on whats best for her kid (if she can get away with it). A DNA swab from epithelial cells is so easily done that Im now assuming that it was.
SO, that leaves us with a "convenient" overreaction of the girl friend. If her world is broken to bits then pwrhaps hes better being done with her because what will she do when something really big comes up (like money problems or a serious illness)?
Nope, Gotta assume that a DNA test was done and this is all post facto reaction.