Found out that boyfriend got his ex girlfriend pregnant... What do I do?

Anonymous
I recently found out that my boyfriend of 2 months had gotten his ex girlfriend (they dated for 3 years on and off) pregnant back in January. He did not tell me but I found out. What do I do? He told me they broke up in May because she cheated on him with his friend. What do I do? Do I ask him about it... Should I break up with him?
Found out that boyfriend got his ex girlfriend pregnant... What do I do?
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