I don't really care if he doesn't make a move on her sexually at this point, but I mean come on dude. She tried to do so towards you. At least come to a firm decision on this in a general sense. She'd marry you if you asked, so the ball is in your court either way at this point. If you're so worried about the potential for you disappearing from this world at some point, full on turn her down and let her move on. If not, live for the present instead of some future incident that may or may not occur.