AITA for choosing not to help my ex?

I had a relationship with this woman for more than half a year, and it was on and off.

She broke up with me last 2022 to return to her ex, but before I found out she already cheated on me with him. Throughout 2023, I only found out that she had a relationship with my uncle who is the dad of my cousins and they made out behind my back. So the family was ruined and she got pregnant with my uncle, and now the baby is born.

She was also asking for child support even if I'm not the father, but I refused. Then, she told me that I'm so bitter for not helping her. The reason why she told me this is because both of us originally wanted to be parents. I also wanted it but not in this way! The most unthinkable happened though, she forged my signature on the child's birth certificate!

I'm now trapped in this problem! After all the cheating and the physical abuse she did to me, I really don't see myself being the dad of this family that I didn't create in the first place! Do I have all the rights to not give her any money?

AITA for choosing not to help my ex?
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