1) He's filthy fucking rich.
2) She's the type to purposefully seek out unattractive males to magnify her own sense of worth, because her girlfriends and other folks will constantly tell her that she could do better.
3) She is an extremely wise and level-headed genius who also happens to wear tight-fitting clothing and use public displays of affection.
Seriously, there's no secret. Girls are people, they're just people who often get a pass on fixing their insanity when they're attractive. There's an old chinese saying, "An ugly woman is a blessing in the home." I bet you didn't look at some average looking 5/10 girl and notice something thoughtful about her dress or behavior and think, "That's really interesting - I wonder what she's thinking about." and don't get me wrong - I'm guilty of the same, it's just that what I've made sense of is that until I'm the type of person who is "better", I will not attract another person who is "better." Or at least that's what I tell myself in the hopes of pushing myself to start getting my act together, being almost 30.