I am married. Does my single friend fancy me?

We call/text once a week. I live in US he's in the UK. Calls are platonic but I wonder why a single guy would bother with long distance friendship. Most of my male friends are married. I can tell if American men are interested in , but this british guy is a tough call. We only met one time while on vacation and have been friends for 6 months. I am attractive and fit if that matters. Husband knows about friendship and doesn't care.