Boyfriend is looking up ex fuck buddy's Facebook?

Anonymous
Before we were a couple back in February, he went on several dates with girls off Tinder as well as me (we met through mutual friends). He posted a photo of one of the girls on Snapchat one night as she was straddling him, so I looked her up on Facebook. She was a recently added friend of his so it was a quick search.

I let it go because we started to get more serious and eventually became official in March. They deleted each other over Facebook and that was that. She lives a state away and they have no mutual friends. I don't think they were even close to being serious because our mutual friends, including his housemate, have never heard of her.

Over the last few weeks, however, I've used his phone (with permission) to look things up Facebook occasionally. So far, this girl has shown up at the top of his search history 3 separate times. I looked her up on my own account and all you can see are her profile photos, so it's not like he's reading her posts and whatever.

He has a lot of female friends, so on the surface it wouldn't look weird. But, I know this girl wasn't just a random friend. If I said, "Who is Danielle?" that would be a little odd because I've never asked about the other girls I've seen him search for. I don't want him to know I essentially Facebook stalked her.

I'm not really sure how to handle this situation. Anyone go through something similar?
Boyfriend is looking up ex fuck buddy's Facebook?
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