TS, if u still want to be her, strongly suggest go for couple counseling...etc
Else pack up

I feel if the situation has deteriorated to the point where you need some random stranger to play judge and jury and priest and pastor to help you “fix” a relationship, it may already be too late and beyond fixing already….

I’m sure they are successful cases, but both parties must want to get it mended - one sided attempt is pretty much a set up for failure.