Why does he stare at me intensely in front of his girlfriend?

Anonymous
He has in the past flirted with me, teased me, even taken my hand and stroked it while looking in my eyes. I always catch him stealing glances or sometimes staring with a serious expression. And sometimes even in front of her. He laughs when I make a joke also and when he does so his girlfriend gives off territorial or possessive body language, taking his arm and stroking it for example. I am not encouraging him. But I can see him from my peripheral vision. He eavesdrops on my conversations, particularly with other men too. And this is not a once off, it’s every time I see him. What’s going on?
Why does he stare at me intensely in front of his girlfriend?
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