Sometimes people don’t deserve a 2nd chance..

So I am now a month away from my due date and I am beyond excited to meet my baby girl. Unfortunately I was given (for a 2nd time) news that no pregnant women should ever hear. My bf has again been reaching out to a girl that to me seems he is obsessed with. A little back story... I found out that he had been contacting dozens of girls through Social media sending in appropriate messages and pics. This was when I was 4 months pregnant. I cut things off with him all while trying to stay civil and allow him to be part of the pregnancy by sending him updates. Between all the corona virus crap and being pregnant and alone... I was absolutely miserable. I decided after a few months apart that I would give him another chance because he seemed super apologetic and sorry for what he had done. We agreed that we would go to counseling and try to work out the issues that we had. He deleted his social media and promised to never do it again. Now exactly 1 month before my due date, one of the girls that he had reached out to on fb contacted me letting me know that he has been obsessingly reaching out to her again. She’s has sent me screen shots of conversation and countless messages from him begging her to get together. I confronted him about it and he told me that she is crazy and it’s all not true. Even when I have screenshots of the whole conversation!! Unbelievable. I was always so hesitant to let him back in completely because I was afraid this would happen again. And sure as shit... it did. I’m definitely done at this point. I should have been done before. But now, I’m wondering what to do moving forward. I’ve never been so scared of a situation I have been in... and was really hoping that I wouldn’t end up a single mom. We are having a little girl and I don’t know how I can allow her to be around such a toxic person. It truly scares me. Before this time I wanted to involve him in everything bc I thought it would be unfair to my baby girl to shut him out. But now I just don’t know. How do you allow someone like this to play an active roll in your child’s life? I feel so lost.