Eww the not explaining things part, and not really being invested in convo unless he's talking sounds famikiar and particularly annoying. That said, it sounds like he is definitely on your team, with the support he's showed you. He just may not be able to see it from your perspective because it is so different than any he's ever had.
For you: Have you ever explored the concept of codependence? I recently read Courage to Cure Codependency (https://www.amazon.com/dp/B07K1YRSRC/ref=cm_sw_r_cp_apa_LY8fFb67J1XXN) and it helped me be less invested/lose less emotional recovery time when my fiance (or anybody else) doesn't react how I'd expect or desire. It also helped me not feel bad about asking for things, not feel like I'm worthless (or a bad person), judge myself less, and more when things don't happen the way that I think they should or that I deserve them to. Well, the book plus daily free meditations from the Insight Timer app.
The book takes maybe a few hrs to get through, max, and is practical, in relatable language (for me, 29F), not pretentious, doesn't get too touchy feely, and doesn't waste words. $10 on kindle, if you don't want to buy message me and I'd be happy to send it to you as a gift!!! Seriously. Worth a read.
TL;DR: I identify with the issues you're having with apparent investment in convo, & suggest the book linked above. IMO it hits almost everything you mentioned.