uncomfortable at work

i’m only an intern at my work but there’s a older man worker who makes me feel uncomfortable , always coming in my cubicle , asked me for a hug on his birthday , wants to take me out to lunch, i’m only 19 and this man is 40-45 I have a bf too and he just makes me feel uncomfortable

*edit

Idk what to do bc everyday he comes in my cubicle and I wanna be a worker here after intern and I don’t wanna start nothing I just feel so uncomfortable everyday at work