Kinda feel bad for Torigoe with how that went, but that's far overshadowed by my relief that (at least as of yet) there's no love triangle BS.
Was that flashback even something we saw earlier? I don't remember ever seeing her before, and that one line isn't a "I fell in love then and there" kind of line. I'd thus have to assume that eating "alone" together like that led to them hanging out regularly, but if she's his friend then why haven't we ever seen her before?