My son's father left me when I was 8 months pregnant. And we were married. Although I was devastated and scared and alone and worried that my son would need his father around, he did us a huge gigantic favor. My son is 2 now and I see now that I am happy that I let him walk away gracefully. Of course, I haven't seen him since, but that is fine. My son needs stability and self-reassurance, not someone who will pop in the picture saying "I'm your dad" and then leave again. No way. And, I was also on the other side of the picture... I was dating this "great" guy, only to find out that his ex was 4 months pregnant. Gee... trying to make that one an okay siutation just didn't happen. The ex blamed everything on me when I was just as clueless. That relationship ended. Be strong!

welcome to the forum MMS

Holy **** that's not carelessness that's more like total disregard for the feelings of others.

I would talk with him if you can (any talks with my ex end in arguing) about not bringing his girlfriend around your child. most single parents know that can be a bad idea anyway. right now your child is likely a bit young for it to matter still its good practice.