My situation was very similar to yours Fitbitironic, although without the issues with female colleagues and port. H has his own company, we have moved countries, he often worked abroad for up to six months at a time, he was doing a doctorate. He had no time at all to give to family life. He treated me as his employee, an underperforming employee. He kept talking about my 'performance issues'. He firmly believed that his happiness was my responsibility but my happiness was something for me to sort out in my 'own time' (I'm not quite sure when my 'own time' was supposed to be for a mother of 2, one of whom is autistic with complicated severe behavioural problems, and a husband working away). He was ALWAYS right, and if I ever turned out to be right about something he would either claim that he had said the right thing and I was the one who said the other thing (gaslighting) or he would find 10 things to aggressively point out that I was wrong about. He blamed me for everything, the state of the house, my bad parenting causing autism
, the fact that he wasn't as happy as he deserved. He would bring me weird presents from airports and then complain for weeks that I wasn't grateful enough, but every single Christmas or birthday present that I gave him was not good enough and showed my lack of respect for him. He was forever comparing me to other wives, with the implication that I should have the housekeeping skills of one, the budgeting of another, the figure of another, the cooking ability of another, the managing of the husband's social life of another. He even said that I wasn't funny, I AM FUCKING HILARIOUS.
Anyway, we went for counselling. I think he honestly thought that he would tell the counsellor how I was 'wrong' and the counsellor would somehow make me change. I went in with the attitude that I didn't blame him for anything but we were both unhappy and that was probably because he was married to the wrong person. It was a good position for me because when he complained about specific issues I wasn't defensive, I could just say that what he wanted wasn't me. I didn't really accuse him of anything, I just pointed out where his expectations and mine didn't meet. The counsellor was excellent, anytime he said that something was my fault, or I didn't do something right, or didn't put his feelings first, she would make him explain and justify his position.
Anyway, the upshot of months of counselling is that he realised that he was being an arse and that he really, really didn't want to get divorced. He spends more time with the family. He pulls his weight a bit more doing things with the DC and cooking meals at the weekend. I don't get it in the neck when things are difficult at his work. He listens to me when I tell him something, he has a better understanding of likes and dislikes. We are still in separate bedrooms, because I found that I slept better that way anyway, but we do have sex when we didn't at all for four years. We have banter, and he laughs at my jokes. The DC don't have to clamour for his attention. He seems so much happier now than he used to be, so life is easier for everyone.
I really recommend that you read Why Does He Do That by Lundy Bancroft. It was hugely helpful to me in pinpointing where our relationship dynamic was going so wrong.