I enjoy reading your posts for you're really putting the hard internal work into trying to see things from different perspectives.
This jumped out at me:
Originally Posted By: Zelda09
I fear that I'm all over the place in how I regard my H, and I don't know if that is something within me, or that is an honest acceptable set of feelings in response to what I see as unstable in him. Where to draw the line between self-improvement and just saying the grass may well be greener elsewhere?
Does there have to be a line in there?
Is it mutually exclusive?
That could be equally applicable to your M as well.