@Attila, I completely agree that what you describe in your last post is sometimes, and probably even often, the case. My point was that the binary tone of your previous posts, both to the OP and @probablysue suggested that ALL those who decide to stay in an unhappy marriage fit that same description.
The fact that others have posted in a similar vein is neither here nor there. On threads like these, people (understandably) draw on their own personal experiences, and no doubt you and I are no exception to this. but the OP's marriage is not the same as that of other posters' parents. same goes for @probablysue. their circumstances are unique to them. and we don't know enough about them to be able to say ‘in MY case i was happier when my parents separated so it will be the same in YOUR case too'.
This is someone else’s life. And I always feel deeply uncomfortable when I read people saying things along the lines of ‘you must leave or you’ll damage your kids’, based on next to no information. People saying this may of course be right, but, based on just a few lines of text, we’ve really got very little idea - the OP’s husband not trusting her and the lack of affection don’t sound great at all, but we don’t know whether there’s constant yelling and/ or tension, or whether they feel unfulfilled in a less in your face kind of way. we don’t know their financial situations (would separation involve moving away, perhaps from existing support networks? would the kids need to be uprooted from their schools? would they struggle to afford the essentials for the kids?) we don’t know whether the kids involved have any additional emotional needs - such kids are obviously likely to find parental separation much harder to deal with than others.
Leaving may make the OP and @probablysue happier, and it may be better for their kids in the long run. Absolutely. But it’s equally possible that, with a chunk of hard work and counselling etc from both parties, perhaps a happier, more fulfilling marriage could actually be secured. At risk of sounding like a broken record, we simply don’t have enough knowledge of the individual circumstances involved here to be able to say 'living in such unhappiness is failure'.