Doodles, You need to challenge some of your thinking. You are not a optimist. I read it in your posts. Google Martin Seligman "Learned Optimism" and look up explanatory style. You have a pessimistic style of thinking - causes depression. It will help you if you do the work.
Read up on boundaries. Your H wants something to do to help - give him something. Tell him what he does that hurts you and causes you to be unattracted to him. Tell him to read "His Needs- Her Needs" and "The Five Love Languages." Let him know you are working on yourself. Let him know that this M isn't working neither one of you are getting your needs met. If this continues then the outcome will be a D.
One of the reasons all the LBHs here are begging you to stay is because they didn't know why their wife was this miserable. They kinda knew it but didn't know how to talk about it. But as you see dropping the bomb and walking away is very effective. Have a plan for reconciling and if things don't work out. Have choices.
Google Seligman it will help you today.
Cheers
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.