If she doesn't love you for who you are, you're better off without her. Sure, dating sucks, as does being lonely, but you said yourself, you work yourself to the bone and she just demands more from you without any seeming consideration for what you need. Be honest with her - if she doesn't want to understand, then she doesn't want you... She wants the caricature of what she thinks is you (which isn't fair for either of you). I've been there, duder... The longer it takes to get it in the open, the worse it'll be when it does.. Hang in there, and good luck regardless of your choice!