Sting and a married man

Yes, u read that right but no...........it's not what you think. So there's this guy at my job, i remember the first time i saw him when i first started working there, i thought he was cute. We had a conversation one day when they had movie night and i found out he was from haiti. I like his accent, it's one of those nice sounding accents that you can't place the origin, I guess cos he's been here for a while. Anyway, last week we were standing at the nurses station chatting while he was doing some paper work and his phone was on the table. He asked me to put in my number. I think he called the next day and we talked about stuff. Me being me, i like to ask questions and never assume anything, but long story short, he mentioned he was married probably like the second conversation. Ok!!!!!

Now, mind you, i wasn't interested in him that way (I have someone else that has my attention at the moment: ;), but i didn't know what to think. I've never made friends with a young guy who was married.... well, if i remember correctly i have. It was this one dude who was like 28 at the time whose wife was in Nigeria. He ended up liking me and i had to nix the friendship as soon as he crossed the line with the endearments and calling me 20 times a fay. Now this guy, he lives with his wife. I notice he never talks to me at home, he calls usually when he is driving and the one time he talked to me at home, his wife was at work. Now i have to say that the dude has not crossed the line at all. We just talk about stuff and when i asked him what he wanted from me (yes, i dey crase like that), he said the first time he spoke to me, he got the impression that i was smart and his smartest students when he was a teacher were Nigerians and he has an affinity for Africans. So according to him, he wanted to test his hypothesis about me. He is a therapist at the hospital and i have sat in on this group sessions and he is pretty good, so i told him that what i could get out of the friendship was free therapy. He thought that was very funny, but i wasn't joking o!

Anyway, i really don't know how comfortable i am starting a friendship with a young man (28 years old) who is married. We spoke on Tuesday when i saw him at work, but i haven't called him and he hasn't called since Monday. He asked why i never call and that he doesn't usually do back to back calling (like call someone everyday) unless they call him back. He's cool and all that and i'm sure he will make a good friend but i don't just want anyone's wife to call me up one day and tell me to leave her husband that i did not want in the first place. Not sure if there is a balanced way to go about this friendship or should i just ditch the whole thing?