^ Maybell, I believe you said you feel stupid because you interpreted H's reaction as him thinking "oh, maybe she has an STD, and it's possible for her to get one because of what I've done" - basically that he was cheating - right? And that you should have seen that as a red flag.
Labug's response is another way to look at that. I don't know that I would assume he cheated in the past, either, from what he said (although it's easy to jump to that now in hindsight). He might have heard "B" and then jumped to something else (Hepatitis B?) and been genuinely confused about where such a thing would have come from... nothing more to it.
Me:30 H:29, no kids T:12, M:4 (when D was final) 12/13: "Don't think I want to be M anymore" 6/14: Separated (I move) 1/15: H filed for D 5/15: D final