[ She falls into step beside him, keeping up with his long strides surprisingly well, even in heels. Big steppy. ]

Aaah. [ said in the voice of someone having a Realization. ] That's why you hate that guy so much.

[ Even in the few weeks she's been here, Ai has Heard Things. ]

I don't get the full story exactly, but... it sounds to me like it's his fault you're lonely.