It was 2, and I honestly have no idea why

What? That makes it even weirder. That means you weren't even being chosen because you were considered to outperform anyone else. Either you were the first candidate, and no comparison could be made, or your were the last candidate, and had to be chosen anyway!

I was his second girlfriend, and he'd just gotten out of a multi-year relationship. We met while interning in SV. We broke up soon after I went back to school, and I think he just ended up getting back with his ex, so...

Ah, so once again, we have a situation where the documentation describes the use of an elegant algorithm, but the actual implementation is a random pile of hacks and heuristics slapped together by someone who seems not to have really understood what they were doing.