This is out of curiosity from reading other people's posts. What does it mean when the SO won't fight for the relationship? Here's a couple of scenarios:
1) when you say this is an issue that's really hurting the relationship and your SO says, if you want to break up then you gotta do what you gotta do.
2) when you are on the verge of breaking up, he just puts up the white flag and lets it happen
I've noticed that some guys out there think that they are just trying to make you happy by going along with what they think you want to do. That they're going along with it for your benefit because they "love you". I know some people threaten to break up to see if their SO really loves them and wants to fight to make it work.
Is it a self esteem issue? If they really love them, then wouldn't they fight instead of letting the SO do what they want?