Welcome to Staying!
With over 500 posts, I'm sure you have built up some skills already! The good news is that it is easier to transfer skills from one r/s to another than it is to build them up from nothing!
I want him and this relationship and am struggling with transferring the DBT skills I use with my dd to this situation.
Give us something to work on or point you at. What have you struggled the most with in the last day or the last week with your H?
Sharing/Venting a full interaction from start to (unpleasant) finish is a great place to start.