Why would a guy tell me about other girls he's dating?

I don't get it. There's a guy, and he's showed off to me in the past. I catch him looking at me sometimes behind my back (through a reflection).

When he was in my vicinity within earshot, he started mentioning other girls he's dating. Then, he'll start flirting with me, and I'll feel so incredibly awkward.

I don't get it. What the hell is going on when guys do this? I'm so confused. I have no dating experience at all or experience with guys. What's going on?

Why would a guy tell me about other girls he's dating?
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