Should I leave her? Try to fix it? Or put up with it?

You should know that a woman's sex drive doesn't peak until almost 40. At the beginning of your relationship it was new and still exciting. And although sex drive changes during a relationship, she should still want you and if she doesn't, that is a big problem. I completely understand if you want to end your relationship over sex because a lot of men would have just went out and cheated instead of making the effort to make things better. If you are tired of talking to her about it, maybe you should give her an ultimatum and let her know once and for all how you feel and that you can't be in a relationship where you aren't wanted. Men show their feelings of intimacy through sex and if you aren't doing that with her, it's hard to be on that level with her. Sex is a big part of a relationship even though it's not what makes up the whole thing. But if both people aren't happy sexually, that's when it leads to cheating and it is much better to leave than to cheat. I suggest a long serious talk letting her know your stand and bottom line. If she isn't willing to budge, maybe you should consider more drastic measures. I hope this helps.