I felt like H and I were making some positive progress. Then...they have been trying to see each other more... This is so frustrating for me because H seems to have regressed majorly...my PMA is in the dumps

Your PMA isn't genuine PMA, is why.

Your PMA appears to be influenced on whether things seem to be working out with H or not.

"Frustration"... what is that but a side result of impatience? Stems from desired expectations not being realized? But what does that point to but the need to cultivate more patience and accept that our expectations, many times, will never be met the way we like, which says more about the having of expectations than it does about dealing with reality.

Turn these switches in your mind that drains PMA off. Build your PMA not on what others do, but on what you do.