Would you leave a partner you love for an ex who hid your baby from you?

Baby was conceived before we met. She got a hold of him through a friend so she could have reached out but chose not to. The baby is over a year old and he is telling me he feels like he has to do this for his kid but to me it feels like he just wants to be with her because how could you forgive her for not telling him sooner? Also there has been no paternity test done to prove he actually is the baby’s father. I’m just looking for clarity because I don’t feel like he is being 100% honest with me so I thought I’d ask guys who don’t know me and aren’t scared to hurt my feelings with the truth.
Would you leave a partner you love for an ex who hid your baby from you?
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