GGGB, just to let you know that Charbon and P&S are both counsellors. So I would advise you to read very closely what they write, especially Charbon who is cutting through the issues you face with a scalpel.
I suppose the hostility is because a lot of us have been absolutely shattered (no exaggeration) by affairs in our lives. I woke up to a large, thin carving knife between my shoulder blades and piercing my heart and it was plunged there by the person I thought was my friend and who I trusted most in this world. Affairs are about anger.
Also I suppose MN is trying to get you to wake up. The flirting and attraction of which you speak is an addiction. It is crack.
Also: I read a wonderful extract today, from a family lawyer saying that teenage girls are taught all sorts of things, don't walk at night, don't go near the cliff face - but they are not taught about the single most dangerous thing a girl will do, and that is how to judge the person they marry [and it followed with a list of good things to look for, and red flags to beware of].
Can I have your steady, stolid, honest, H? He sounds like a wonderful friend and life companion. How you describe him comes up in the good list...
I will swap him happily for the handsome, mysterious, brooding, hinting of troubled, intense self-absorbed person I was stupid enough to marry.