My friend's boyfriend is texting me?

I've only met him a couple times, but haven't seen him in a good six months and he's dating a pretty good friend of mine (we hangout every couple weeks.). Anyways, yesterday he made a group on Facebook asking for everybody's numbers. I thought it was a different guy, so I posted mine. Now tonight he's texting me, just casual conversation. We don't have any of the same friends or anything. Does anyone else find this weird?
My friend's boyfriend is texting me?
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