Actually I don't feel anything is more indicative of depression. All of life holds no joy not just the marriage.@M So what is your wife “burnt out/stressed out” about exactly?
How old are you both? Do you have kids?
Since you mentioned LGBQT, are you and she on the same side of the political spectrum?
Sorry to say “I don’t feel anything“ is equivalent to a phrase many many people hear when their mate has moved on to greener pastures with another. “I love you but am not in love with you”, coupled with a drop in intimacy, plus refusal work on the marriage, are all major red flags for infidelity.
I’m not saying that’s the case here, just giving you proper forewarning. Brace yourself.