My colleague talks to multiple girls but questions me?

I work at the hospital and a colleague at my job approached me about me being new and we had small talk months ago. We would greet each other and while walking pass him he would stare at me intensely. I noticed he likes to stare at everywomen walking by and I noticed him speaking with another woman as I was talking to someone up front and he looked at me quickly.

I sorta got an idea of the guy he is and I took a step back because I don’t want to be apart of his roster nor giving him the wrong idea such as interest. I noticed he would stare at me but I would mind my own business and avoid interaction if we’re not close.

He approached me yesterday after spotting me in the hallway to say “I’m a serious lady” and I questioned him and he mentioned something around not giving him a chance, ignoring, or not letting him in (can’t remember). I responded to say we’re speaking right now, im an open person, and he walks by everyday and never says hi. He goes on to say now he knows or something of that sort for now on he’s going to say hello and good night. He started doing that and im confused

I have nothing against him but I’m not too sure what he meant by his approach? If he wants to speak he can always approach?
My colleague talks to multiple girls but questions me?
My colleague talks to multiple girls but questions me?
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