Is My Man Flirting With Other Women?

by Shuang
(Montreal, Quebec, Canada)

I am in a relationship with a "nice" guy. He's really kind with everybody, but I know and he acknowleged that he has a lot of girlfiends.

There was a time, his friend said to him "oh, I thought you know all the women on the planet." I don't know if he was joking or not, what he really meant.

Is it normal that he says to a girlfriend "When you're gonna come back to Montreal, I miss you"?

I've never met this woman, and on the new year day he calls her first to say happy new year. Well, I know she knows I am with him. Plus, he has Facebook, and there's an application called "are u interested in me?".

I think he's checking who is interested in him, and who he's interested in. Well, he never does it in front of me, because he knows I don't like it (and I don't do it either).

So is it normal for a guy in a relationship to do such things? Why is he doing it?