Husband got affair partner pregnant while we were separated

Just found out today. He also admitted to cheating on me 2 yrs ago when we were still married/living together. About 3 weeks ago he called me crying and begging for forgiveness telling me none of this was my fault - it was all him, he's made so many mistakes, yada yada, and he loved me and wanted to make it work. I am distraught. He has now bought this woman to haunt my son's life forever. What am I going to tell my little boy about his new "brother/sister". Its so sick. He told me he broke it off with her 5 weeks ago, told her he still loved his wife (me) and wanted to make his marriage work. I asked him when was the last time you had sex with her, he said 3 days ago. Then he said but he hadn't seen her for 5 weeks before that. I asked him why did he do that he said he didn't know. I felt sick to my stomach when he told me. Who has unprotected sex these days? I asked him was he happy with the mess he's made of his life he said no I'm ashamed and stupid. I'm filing divorce papers next week. I have to get away from this chronic liar/cheat or he will continue to destroy and poison my life and my son's. He already has a 20 yo daughter to a woman he "accidently" knocked up. He has been diagnosed with BPD but still... he makes bad decision after bad decision.

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