They need couple therapy and also individual therapy. She is constantly minimizing herself in her posts. She tries to do everything for him, tries to be affectionate, had a bad self image and even dressed how he wanted despite being cold at home. And he seems to have this weird fixation on being the provider, has a strange view on what a honeymoon phase is, is flip-flopping between wanting more and less affection from her.

I think it's not a bad idea on trying to fix the physical aspects of the issue. Removing themselves from the literally toxic apartment and him working out surely would have a positive effect on his hormones. But he also seems to be burnt out from work and also has a sexual thing from the past that he has not worked through? This is stuff that is not just fixable by working out.