What would you do

EDIT: I have not been sexually active with him for 6 months since I found out. I have been tested I am clean. I am in counseling. I live with my son just me and him. The thing is his dad still helps somewhat financially. And believe it or not he is a good dad. They are close and he sees our son every day so i can work part time and just because he wants to see him. We alternate weekends. I just still have to loan him money on occasion and like beg him to pay bills. Also his license is suspended. I currently drop off ans pick up our son when he sees his dad. I'm just struggling finding a balance because he is in my life forever now. We have a son and I have bad anxiety so i hate the thought of court. I cannot ever lose my son. He is my entire world he cannot not have me in his life. I am what is best for him 100% the thought of him not having me or vice versa it kills me. It absolutely just destroys me to think about. I've never loved anyone or anything the way i love my son.

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With a guy 8 years. In the beginning it was rocky or w.e he admitted to me once he thought of his sister while having sex with me or masturbating. He said he always did. He admitted he thought of his mom and dad too. (I was in extensive counseling but tried to be compassionate and understanding. I loved him i wanted to work it out) Fast forward 8 years later we have a 2 year old and a half year ago i found out damn he is bi. Not only is he bi, he likes being bottom and sucking off guys he would meet on CRAIGSLIST. The horrible emails I read. Him trying to get tag teamed by 2 guys. Him trying to have a 3sum with a guy and his girl. Him ans his "boyfriend" joking about how we were moving closer to him. I genuinely thought we were IN LOVE. We broke up when i found this out. I took a trip to my dads to get away. While i was gone i admit i was extremely depressed, i had attempted suicide and i didn't know how to continue life the pain i felt i had no clue how to be a mom. He told me in a fight how he would take my son from me. He said i was a bad mom and i don't interact with my child. I admit my interaction went down so much when i found out about the cheating. I was NOT able to be the mom i used to be. Not a day goes by that doesn't pain me thinking of months i lost of my sons childhood due to my depression from finding out that awful shit. Im finally gaining financial independence. My ex still knows how to control me in ways. We don't live together but he takes advantage of me. I just still love him! I know we can't be together but my heart is so big. Anyone with anything to say please do.