The security guard at work keeps hitting on me and acts flirty creeping me out...

i don't wanna be a snitch and tell my manager...but he's really annoying me, like he asks me to go home with him every night, or stands too close to me, or keeps staring at me. I feel really uncomfortable and don't know what to do. Any advice?
The security guard at work keeps hitting on me and acts flirty creeping me out...
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