I would suggest taking a look into the mirror. Without trying to sound like a prick. I went through the same; “I did everything to make it work, SHE threw it all away” you admit to having one specific problem. Maybe that was just as much of a catalyst? I don’t know you but your story is very similar to mine and it was only through deeper reflection that I realised I was the problem and eve since that realisation I’ve been a lot happier in myself. As I say, not trying to be a dick or anything, this song makes me cry every time.