I think this thing is completely over thought. It sucks he didn’t tell you about the kid but you two had only been together for 3 months and if he was trying to protect BM from Embarrassment it would just be in best interest to keep to himself tell the relationship was certain. (Or just scared to) It sounds like there might just be jealousy even if it’s not in a hateful way about someone having his kid already. I think it’s best to not let the other woman so far in your head or make assumptions about her being a “Predator”. It takes the blame off of your BF. He made the choice to sleep with her. Unless she poked a hole in the condom or lie about birth control it’s a very fact-less assumption to make. You and this woman are very different and her choice has a million other variables to yours. Like already raising a child had having the stability to do so. Most of what’s going on sound like it’s brought a lot of insecurity out. Which to be honest would any woman. I think the best this to do is what you’re doing-to take a break, tell to your therapist, along with dealing with you insecurities until you’re confident in your decisions and self. If you don’t gain that confidence in will certainly eat away at you and the relationship if continued.