Yeah. We forget that even though women tend to be on the "submissive" side of relationship dynamics... there is still a lot of power in this role.
You can literally have a man pay for your house, car, etc. And when you decide you are done, you can still keep said possessions. It's an investment. (Provided he isn't abusive)
There's a reason why some women are conservative.
This is why as a man, you gotta be:
A) cutthroat with your selection.

I'm not saying all women are like this, but it is very easy for a woman to use you

. And B) Make sure that chick is REALLY into you. As in, your her type, she actually gets turned on by you, you're fukking her the best she's been fukked, and she respects you as a man. In this case, this woman clearly did not see the step husband that way, hence why she had no qualm leaving him once the baby daddy entered the picture.
Make sure you're
that guy for her. Otherwise, she'll have no problem collecting child support.