Just a quick note; you're becoming her "best" friend and the longer you let this drag, the worse it's going to be and the more "friend-like" she'll be to you.

1st rule of friend-like behaviour: he's always around when I need him while I don't have to be.

To be honest; you're encouraging it, hence why it's easy for her to treat you like a doormat. Until you get out of the doormat zone; there's basically nil/little chance of anything developing.

Looks are mostly secondary to women; what matters most is the ability to be a man (hence why most good-looking women end up with jerks) when it matters most.