From what I've read, doesn't look to me like she has realized and there's been no closure.
The BG book's new love interest is so far presented as a guy who apologizes for his current girlfriend--who's a college-age mean girl--when she knocks books out of Steph's hands on purpose, same prize of a guy tells Steph his current girlfriend's a bitch and puts said girlfriend down with a 'time of month' joke to Steph. Who wouldn't want to be *that guy's* possible love interest? What a catch!
(And I think it's silly that they're in the batcave.)