Am I (28f) pregnant overreacting or is my (27m) partner cheating?

I am 19 weeks pregnant. I just found out that my fiancé has been subscribing to 3 women on only fans. Two of the girls he knows personally. One of them he’s actually slept with in the past. Purchasing $50 videos and personalized messages. Also purchasing personalized messages and was having (non sexual) casual conversations with another girl - although she was sending nude pics in the messages. He has spent over $500 since October (when we found out I was pregnant) on supporting other girls pages. Important to mention, his only fans account is anonymous. I am very chill when it comes to the use to porn on sites like Reddit, pornhub, etc. My only boundary (clearly stated to him) is that I never want him interacting / looking at women we personally know. I feel like he has betrayed my trust. I also don’t want to overreact. Please help.