[maerF0x0]

Recommendation you didn't ask for (just skip if not open to it).

Seven principles for making marriage work[1] - has great advice for many sorts of committed romantic relationships.

Also if he's criticizing you as you described he may want to consider talk therapy/CBT to come to an understanding of the nature of his frustrations and his inability to productively communicate them to you.

[1:] https://www.goodreads.com/book/show/849380.The_Seven_Princip...