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Are my coworker’s flirty signals romantic interest or just friendliness?

We met in June. Clicked right away, he would be in the one office room when I started my shift, then he stopped after awhile. He's says hi to me everytime we pass by each other, but doesn't do that with everyone else. He would come find me if just to play on his phone and stand near me.

he's less nervous around me, looks me in the eye longer now, seems to find an excuse to talk, like the one day He had passed by me a couple times. Didn't say anything but then the third time said oh that sign is wrong or oh that basket shaped like a pumpkin looking at Halloween decorations that was near my area.( work on retail)

Me and my coworker guy was walking past him and we laughed about something and a few seconds later he came walking up asking us what's going on and then we started joking and it was like an argue flirty kind of thing. Anyways, I wonder if our coworker had said something to him because now he changed his behavior, he's not stopping to make conversation as much, now he's talking to our guy coworker friend more.(which is fine) He knows I'm friends with him, not sure if coincidence or not.

The one day he made fun of me, I said ok I don't like you while laughing. Then he came back to point something out on a shelf & I said didn't I say I don't like you anymore? smiling he said no, that doesn't make sense., I don't except that big smile and walked away.

when I go into the office when he's in there he's quiet, but if he comes into my space he's more talkative.

he stands near me in the meetings, smiles at me all the time but he's also a nice person, Im not sure if I'm reading to much into this, I have no idea what to say anymore, I really like him though.

Updates
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My mind keeps going too but he's nice to everyone, but he talks to everyone, he's just bored only reason he talks to me, it's all in my head, blah blah lol

I keep thinking maybe he isn't sure I like him? But how can he not by now? Once in a while I'll give him a protein bar I know he likes, I write smiley faces in the office so he's sees first in the morning. I don't want to come off as too needy or scare him away so I try to stay quiet & let him come to me first.. thanks guys
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Today he asked me to help him with something while at work and afterwards I don't know what it was but it turned into this arguing, joking, banter with our coworkers around us listening & staring and It's not the first time this has happened. It's like we go a while through a shift not talking and then all of a sudden the energy just builds up into this whatever it is. He only does this with me, but I'm trying not to read too much into anything. I don't want to derive myself crazy lol
Are my coworker’s flirty signals romantic interest or just friendliness?
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