I really like the Gottmans and have gone to their workshops:

https://www.gottman.com/blog/emotional-attraction-maintaining-connection-in-conflict-discussions/

I realize that over the years I have lost a lot of empathy for my DH. What I used to feel supportive of - things that upset him - I now am much less tolerant of, for example. We have a load of problems, but the question here is: what might be some ways to "recharge" the empathy meter. He's not a bad guy, just annoying.