Saw my Fiancés porn history on Reddit

Title says it tbh. In the beginning he started getting protective over his phone and I noticed. I thought I’d find a women coworker he brings up sometimes. Ended up finding his porn history. I’m not sure how to feel. We haven’t been doing the best and aren’t as sexually active. It’s only been a year. I brought it up to him and he kinda laughed? Than got serious and said “I don’t want this to make you think I love you less.” I’m currently 27weeks pregnant and not interested in sex, I grew up in a world where “If you don’t give it to them, men will find it somewhere else” I feel like I shouldn’t expect more. I guess he needs to get it out. How would you feel? I feel empty and sad, I grew up in such a terrible household and now I feel like I’m in one again. I don’t have family support. I don’t even talk to the majority of my family. I don’t talk to many people anymore and I barely go out. The thought of being a single mom is nails on a chalkboard. I’m discouraged for life ahead. I don’t want to be alone but at the same time I want to be alone. Things are sad alone but nothing hurts you. Do you think I should just let it go since we aren’t active?