Friends with a married man?

I'm single, and recently at a party I met a fun group of people. Several of them are now my facebook friends. One guy, who happens to be married, messaged me about going running. We had all been talking about a running group at the party, so he might be just trying to be nice, but I've been hit on by married men in the past so I'm very cautious about spending time with men who are married.

Eastbaymom wants your take on these quandrees too.

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