Thanks 1950sHousewife - I was actually all set to leave this thread, as I felt the misunderstanding was getting too much (the flaming I can cope with it's too much effort to try and set everybody straight who's adding 2 and 2 and making 5). Thread title was only supposed to be a "soundbite" of something stupid going through my head, was kind of thinking I'd start another thread with a bit more detail. But there are some very helpful comments on here - particular thanks to RandomMess (there are others - yours just really hit the mark).
Yes I need to be more assertive - but then I find it hard enough as it is to bring up subjects I know DW doesn't want to talk about and will likely end in an argument, even without as RandomMess mentions the issue of depression making it so much easier to just do nothing. All those who suggest I'm afraid of dealing with this properly and bringing it all out are right - I arranged the Relate counselling, and have managed to say some things I've had bottled up for years, but clearly I've still held a little back. I suppose I really am at the "nothing to lose" stage now though. The thing is I don't want to leave - I do love my kids and would miss the family we have - I do love DW as well. The trouble is, the family is enough for DW - whenever asked what she wants from me it's always something related to that, not to us as a couple - it's not enough for me. It just feels horrible - the idea of me leaving came up yesterday, with DW suggesting it wouldn't make me happier, to which I agreed - at least not for a year or so, but I have to hope that it's possible to feel happier than I do now in the long term.
She's now gone to bed - we didn't talk, no physical contact (I'm trying poshbird1's suggestion of backing off, but in reality I know it won't get me anywhere), but it was too late to have this conversation, as I'd been busy trying to get a bit of DIY finished off (the astute will probably suggest I'm putting it off). In reality this is actually one of those threads where eventually somebody will point out that the OP already knows the answer though, isn't it? :(
A few specific things which have come up:
My mental health might not be DW's responsibility (in the same way my happiness isn't), but if I suggested my depression was largely due to any other factor I'd be lying. What exactly am I supposed to say? It's not something I'm just making up as an emotional blackmail tactic (though I don't know why I'm even dignifying that comment with a response) - I think I've got a fairly good understanding of my own moods, if not any control over them, and no I'm not getting any satisfaction out of this situation. Elsewhere on this thread everybody is telling me I need to be brutally honest...
JosieZ - DW has a hobby, out 1 or 2 nights a week doing that. We often sit in front of TV with a glass of wine (our viewing choices largely coincide). I'm very sporty and have lots going on outside the house - I'm sure anybody who met me in real life would think I was very dynamic - she actually mentioned yesterday that was one of the things she found (past tense deliberate) attractive about me. I'm not always depressed, though it doesn't seem to make a huge difference to how attractive I am. As others have identified, she's either just not interested in sex or not interested in me (I suspect both).
DuelingFanjo - DW described it as an ultimatum, she sees the suggestion that I might leave as blackmail, when for me it's just trying to be honest. The counsellor actually also suggested our relationship wouldn't survive in one of the sessions - though hasn't given any suggestions about what we (I) should do. We've not really had that many sessions, and probably not got to the conclusions stage, though whilst I'd have liked to keep going I have to admit it didn't seem like we were making much progress in them any more.
Oh, and the orgasm thing - that's not just during sex with me, that's never in any way. As discussed in a previous thread, I'd really like to be able to give her one, but when she's never masturbated and doesn't seem comfortable whenever I try doing anything which might help in that way (from my limited knowledge of such things, so maybe I'm just doing it all wrong - but then I don't get any other suggestions).