Can't remember where I saw the figures, but in sonme survey about 45% of couples claimed lockdown etc had made their relationshop stronger 51% about the same with 4% saying it had got worse. Kind of surprised me to see that final figure so low - would also be interested to see a breakdown for people with kids and without.
But then maybe there is a degree of appreciating that you are together and have someone to be with and touch etc and even if things aren't perfect, it's better than being on your own?
DH can have a temper (comes from a shouty family) though he has been getting much better in last few years, so I was a bit worried at the start that the stress could get to him and that side would come up again but actually he's been really good and generally this has made us stronger as a unit.
I'll admit we are probably helped a lot compared to many households by the fact that we don't have to worry greatly about money - I received an inheritence in 2019 that would be enough to keep us afloat for a while if anything happens to our income, so that removed a major potential stressor.