i think the best thing to do is tell her there's a possibility of it being yours. i think its reasonable for her to be a little upset about that but its still a jump-ball about the kid really. tell her its a maybe and tell your ex-fuckbuddy if she thinks (or you do) its yours to get it tested ASAP. because no use in bringing this probelm into your life if its not even yours. and the way i see it, if the new girlfriend splits because of the situation, you're better off and you'll find someone more understanding. either way, good luck.
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