A creepy guy still messaging me even though he knows I have a bf

Michelle • 22 year old girl with a love for art

I have a long distance boyfriend of over a year and its a serious relationship. I'm at school and he's in the military. Recently I got a job at the dining center on campus.

One of the guys I work with on Saturdays started messaging me calling me beautiful and talented and inviting me over to dinner, even after I told him I had a boyfriend. Neither my boyfriend or myself is comfortable with this, but I have to work with him and so I don't know how to handle this. My bf basically wants me to tell him to fuck off, but I don't want to make work so awkward its uncomfortable. What should I do?