Just had his baby and found porn on his phone once again

I’m feeling so hurt and betrayed. I was up breastfeeding our child last night (he’s only 3 weeks old btw) trying to stay awake I left my phone across the room didn’t want to disrupt our feeding I got on my fiancé’s phone and started to type In Facebook in his search engine and a whole bunch of porn sites like free porn show up in his search history. He has known my views on porn from the beginning of our relationship we set boundaries together I have told him that even in the Bible god says that looking at a woman in lust you have already committed adultery with her in your heart. This is not the first time I have found porn in his search history and I have confronted him before. He has pictures of me and videos of me on his phone. So for him to go to porn is a stab in the back first of all we made boundaries and he crossed the line and second he is choosing another woman over me. He’s also cheated physically with another woman while I was pregnant with his son. I really want to leave him but don’t want my son growing up in a broken home like I had to. I’ve forgiven my fiancé multiple times for cheating and he just does it over and over. He has no respect for me. At the same time I don’t want my son growing up and watching his father treat me poorly and with disrespect and him grow up thinking it is okay to treat a woman that way. I can’t help to think I am raising someone’s father, someone’s husband. I want to leave but am afraid I won’t be able to financially support the two of us. Idk what to do.