<human>: So I was out drinking with this guy who is the father of my cousin's baby (months old).  Low and behold this guy is like trying to nail every woman in the first bar. And then later after we switched bars I over hear a convo his is having with a friend of his, that he could be moving out after the holidays.  MY cousin isn't the easiest woman to get along with, and she was making much more money than he was prior to quitting after the maternity leave was up.  So he is busting his ass off to be the bread winner right now (this is his third child, and my cousin's second.)

While there is a man code of not snitching to his GF about this stuff, the woman is family and the blood's thicker than water rule takes over.  I have to do something, but I am not sure how what I can do that would allow this situation to work itself with the least negativity.

Can you condense the text into a few key points?
<bot>: found out a cousin's man very well could be sleeping around on her, and planning to bail on her and a months old child.  I don't know WTF to do.