Vent: my coworker is making work a bit uncomfortable for me lmao

Hi, I am a happily married mother of 3 (just got married May 28th of this year). I work in retail as a customer service supervisor. My coworker is a security personnel. He only works Fridays, Saturdays and Sundays usually the same shifts as I do so we've been friends for like nearly 2 years since we both started working there at the same time (yes my husband knows and is ok with it since I have been open and honest). We only talk at work. We don't hang out or talk on social media. So while i was near the end of my pregnancy with our 3rd baby in 2021, this coworker told me he had feelings towards me. I don't, so I let him know that and told him we can only be friends at work and I expect myself and my relationship to be respected. It was totally unexpected. I also apologized if I did anything to lead him on or whatever. He understood and I distanced myself a bit because again I don't want him to believe I had any kinds of feelings or that he had a chance with me. I tried not to ruin the friendship but he keeps making it weird for me. He's constantly eyeballing me when I pass by or when I'm with my cashiers (his post is directly in front of us and the door) and he's made it obvious that he's crushing by his actions when I'm near. A couple of girls had a crush on him and would try to be all flirty but then I would walk by to do something and he'd keep his eyes on me, ignore their conversation or even include me in the conversation. It's making me feel super uncomfortable since the girls keep asking if we have a thing or if I'm his girlfriend 🥲 I just wanted to make friends bro idk why he had to go on and have a crush on me, literally the least attractive person there! And the least available. This is why people say men and women can't be friends 🤷‍♀️🤦‍♀️ I honestly don't know how I can just stop being friendly with someone I work with! Rant over.