Thanks for all your responses - some of them are a true inspiration!
Saffy:
I'm really sorry to read about what happened to you. The lying, deceit and your X's way of dealing with your pregnancy would be deal breakers for anyone, I guess. They certainly would be for me. I hope you're doing okay now - sounds as though you definitely deserve some happiness.
want2sleep:
That's interesting about the guy you mentioned - I suppose this may really depend on what your approach to loss of a partner is. As mentioned somewhere on this thread, I used to date a guy who was bi (which I knew from the get go) and who ended up cheating with several other women. Personally, I always felt that this was worse, exactly because there was someone of the same sex "in competition" with me. My take on this at the time was that, if it were men, at least I would have known exactly what they had that I did not.
Springchicken:
And I would add, as someone else did, that there are basically no guarantees that anyone's partner will not fall in love with someone else and leave. That's true of straight, gay and bi people in monogamous relationships.
I think this is a really sensible, great way to look at this. Planning to adopt it ASAP. Thanks!
Loiner/Amber:
Thanks for your input - being able to form some sort of an impression of what something like this might feel like from another perspective has really been food for thought. Yes, I'm still a bit shaken and a bit insecure. Knowing that I have a partner who loves and adores me and who makes it very clear every day of my life that he finds me incredibly sexy really, really helps. And so does reading that sexual orientation may not be the only factor in determining whether or not one develops these feelings for another person.
DH has in fact been great about this - to a much larger extent than I had previously considered him capable of. As mentioned somewhere he's not much of a talker usually. His family basically don't do feelings at all ("I'm fine" and "I'm fucking pissed off" being pretty much their whole range of acceptable emotions for males). I am still asking questions and he is answering them honestly.
Some of you have wondered what triggered his telling me. I think Mumfun has pretty much hit the nail on the head re. self-awareness there. DH says that it took him a long time to recognize and then admit to himself he even had these kinds of feelings (I blame you, PIL!
). He also admits that, once he had figured it out he felt scared shitless of telling me and of how I would react. Which, I suppose is no good excuse but somewhat understandable given that he did tell me after a relatively short time.
For what it's worth: DH insists that he would not dream of leaving me or cheating on me and that I will have to be the one doing the walking if I want "us" to be over. At the moment, I honestly don't think I do. I'm still coming to terms with how the premises on which I thought our relationship was based.
I reckon DH makes kind of a good point when he says that if he hasn't cheated in the last eight years - even when he met some women he found stunningly attractive - he doesn't see why he should start doing so now.
Still working out lots of stuff in my head and nowhere near done. I'm still feeling insecure like hell. Still thinking about a whole range of things to do with us.
The good news is, though, that I am starting to feel confident that somehow we will end up in a place where both of us are happy - whatever the final outcome of this.