That's a bullshit excuse for being aggrieved? Wanting more time with his mates? He can make the time for them, but not you? You spend enough time together in the house. That's insulting.
On the verge of divorce, its not surprising. If he valued you and actually wanted to make it work and be with you he'd make time and put in the effort, not come up with bs excuses that hes been working and doesnt have the time. He has time for ice hockey, and trips away.
I'm not saying he should make the effort - i'm saying he'd already be making the effort, he'd be in the room rather than you having to drag him there. You can't make someone fall in love with you, you can't make them put in effort, it's just what they do when they want too.
If he were interested in making an effort in a relationship, he'd commit to giving you his time, effort, and attention, there would be date nights, babysitters so you could spend time together, weekend trips away, concerts, hobbies together etc. like he does for the people he wants to spend time with... whereas you get the "we see each other all the time at home". Nope.
but it must be something in my behaviour that he feels I’d be unhappy about it.
Stop with the "it must be me". It's not you.