Why is a guy who has girlfriend staring at my face and eyes and has flirted a lot if I dont dress or talk sexy or anything?

Anonymous
Im depressed and just a quiet girl anyway. He got to know me a bit over like the past year just at work. At first i assumed he liekd me then he said he had a girlfriend and i was surprised. I assumed he was gonna ask me out cuz he was flirting, etc. It was a lot of attention he gave me.

Anyway he flirts with other girls at work too now. But i try to cut him off and not show interest back. But today he kept staring in my eyes and my face even when i wasn't looking.
I dont get what he wants after 1 year of this? Like doesn't it get old? he's not doing anything either way. Also he has kept talking about how we should rent apartment together since we are both poor and how we would be good as roommates. Its hard to find place to live so im not totally opposed to it. I mean id rather that than be homeless right? But also a while ago he said we should watch a movie at my place. In the moment i didn't realize he was implying have sex cuz i dont have premarital sex and i just assumed he meant movie watching. Then i quickly realized he was implying have sex wtff (im assuming he meant it anyway). But yeah no we never hung out ouside work til this day. I don't know its just so much stuff. Like he's been staring and flirting for almost a year. Why? What does he get out of it? Sometimes he's not as interested and just flirts with another girl though. So maybe he just flirts with whoever is there put of convenience like we are a toy and he doesn't particularly care who we are?
Why is a guy who has girlfriend staring at my face and eyes and has flirted a lot if I dont dress or talk sexy or anything?
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