What's on a man's mind when he knows you have a guy but he still wants to be friends?

Whats on a mans mind when he knows you have a guy but he still wants to be friends?

What is on a man's mind when he is trying to make friends and set up a date with a woman he just met and she says she has a boyfriend but he still insists he doesn't mind, he just wants to be friends?

Can I take his word for it? He is a DJ and I've always liked Djs. But I only want to be friends. I don't want to risk anything that will cause trouble in my relationship.

Updates
+1 y
I have stopped taking his calls and responding to his messages which have started becoming flirty
What's on a man's mind when he knows you have a guy but he still wants to be friends?
Post Opinion