<human>: Long story short, before she and I started dated, there was a girl on Tumblr I had talked to a few times. As far as I can remember, nothing serious. But now the two of them message back and forth. As far as I know I haven't come up yet, but I'm afraid I may. And I don't want to to think that I was ever cheating on her or ever wanted another girl. (At the time, I honestly didn't. I'm mainly just being paranoid.)

What could I say if it ever comes up? I haven't spoken to this girl in MONTHS. But I originally met her on OK Cupid, and don't really want that secret getting out either. (Because honestly, who's not embarrassed for being on there?)

Provide a brief overview of the text.
<bot>: Current girlfriend is becoming friends with a former (friendly) OKC fling. What do I say if it ever comes up?