If this is the way she treats you now then I got bad news for you bro, its only going to get worse. To me its seems like she doesn't love but just wants you to be there when she doesn't find the person she is looking for. If you truly feel that this is the girl you want to spend the rest of your with, then great but if you feel that you can't see yourself spending your life with someone like that then you know what to do. Everyone here gave you good advice but its useless if you don't know what you truly want.