TL;DR
I caught my bf cheating on me with his babymama who knew about us (not blaming her but just saying), and I did forgive him because I wasn't thinking rationally, I was just too scared of losing him at the time. I agreed to stay in a lowkey relationship with him because she got feelings from what happened between them, and was threatening to not let him see his son anymore if he ended it.
That in itself hurt me a lot, but recently "they ended" things and we got back together "publically".
However, few weeks later she keeps sending me videos of things they do and talk about, because they still do talk since they coparent, she keeps forcing him to block me off everything. She showed me a video of him a few days ago that she recorded of him admitting he cheated on me multiple times. I'm ready to leave I feel like a total jerk for even deciding to forgive him. When I told him I'm done he was telling me how I threw an entire relationship we built in the trash and I didn't love him enough, basically all this stuff that made me feel bad. What do I even do..