Why does this married man keep flirting with me ?!

I’ve even told him I wasn’t interested but every time he sees me he still approaches me try’s to hug me calls me babygirl and crap it’s so gross I’m only 22 and he’s 38!! !! He has a wife and 3 kids !!! Yesterday I was sitting at work just doing my thing and I see him looking at me from across the room and I’m like oh boy here he comes so I get up and go in the hallway and he follows me out there looking for me ! So I wait till he’s gone and then go sit back down and what do you know he comes to me and starts trying to flirt with me asking for number, social media and stuff of course I said no but wtf why can’t he just get the hint I don’t want him and he’s married !! Smh 🤦🏽‍♀️ what would you do this is like harassment! Cause he won’t leave me alone Help it’s making work miserable !