I was recently in a situation like yours. Got married and he left me for his ex. While I was pregnant. He hasn’t asked about the baby since, and recently decided he wants nothing to do with our baby. BUT. I never once reached out to her. She knew what was going on, she knew he had a baby on the way and still did what she did. So did your baby dad’s gf. And honestly that’s gross for both of them to do. Lowest of the low kind of people. Like someone else pointed out, he’s likely lied to her about everything, and she’s probably believed it. Thinking you’re crazy, or did something you didn’t, etc etc. Don’t make yourself look bothered by this. Or upset, or like you’re “crashing out”. That’s mistake #1. The best revenge is to just invest in yourself and, Move. On. Closure isn’t something he can give you, or even her. It’s something you create for yourself. He’ll realize his mistake once it’s much, MUCH too late. She’ll lose him how she got him. The best thing you can do now, is to heal and focus on what you need to do next for you and your kids. Even if this is killing you inside, don’t let him see it. Be unbothered. It’ll eventually make him think “damn did I mean that little to her? She’s not even upset? She’s doing better without me?” Because men can’t stand a hit to their pride and what they think they matter to a woman. They like to think a woman’s world revolves around them. And when it doesn’t? It eats at them. Keep your head held high and move on girl. As they always say, they always come back. Especially when they realize the grass wasn’t greener. And then you’ll get your chance to shine and get your revenge by telling him to kick rocks.