My (F28) ex husband (M27)got a girl (F20-21) pregnant and then immediately dumped her

My ex husband recently got into getting women pregnant and dumping them. He started with me, but we were married.

Within a few months of our divorce being finalized, he got a new girl pregnant and immediately dumped her. I didn’t like that because the girl is younger than us, and it felt like a really dirty trick.

They’ve been together 4 months. Sure it was her fault too, but it seemed extra yucky because he’s a good 6 years older than her. She’s in her early 20s.

The new girl is a waitress who just moved in with her mom to make ends meet. I criticized him for dumping her because he said she just “wasn’t the one.”

His immaturity about the situation annoyed me. I asked if he was going to pay her child support, and he said he can be a good father without paying child support.

It made me angry so I typed up all the tips I could give her that I learned the hard way. I sent them to her and told her she could use the info or ignore it but that I felt she deserved to know.

I totally acknowledge that this is none of my business, but I went through it and I feel for her. He is manipulative. Should I have just let it alone?

He told me never to talk to her again but our kids are siblings. She also did not have any complaints about me talking to her.

She didn’t even tell him what I said, but he’s jumping all over me about it. I don’t want to see that baby or the mother hurt the way we had to. We (my baby and I) struggled for a long time to get by.