He told me about the baby..a day before the shower. Should I message the girl?

Me and my kid's father have been on and off for about 5 years. Earlier this year he recently expressed to me that he would like to work on us. Still very hesitant, i didnt stop doing me. A little dating here and there but nothing too serious. He would go ghost for weeks at a time and then randomly pop up again. I never thought anything of it because we weren’t"exclusive" anymore but we were still a family working to get us back.

Well a few weeks ago.. he dropped a bomb on me. The girl he has been messing with is now pregnant. At get this... the baby shower was literally the next day. I am devastated. You have been fuking and sucking me unprotected as well as her obviously. You never wanted your family back and you played me like a fool! peep this... the girl knows Nothing about me. Should i message her? Let her know we are both getting played...or just walk away. He is still telling me he wants his family. But HOW? How would that even work?

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