Is this starting to get inappropriate?

Helloeriss01
I have a coworker. I don’t have a crush on him or anything on just curious because of some of his behavior.
He does know I am dating someone because I always make it clear to everyone lol and I always talk about him.
He’s friendly and his mom also works there and he’ll tell me hey and “welcome to work” and stuff like that lol but he does it to everyone else. Once I was coming into work and I walked in behind a customer and he said hi to the customer then did a double take and said hey to me.
I see him talking to this other girl frequently who also is a work acquaintance of mine and she’s rlly nice. I’m a cashier and sometimes he has to help on the register so he’ll come beside me and once he asked where the receipt paper was and o told him and it ended up being somewhere else and he was like “you lied” and was smiling.
Today I came in and I looked overwhelmed because of the sale snd he looked at me and asked was I ok. He also kept saying random things I guess to make small talk. He kept lingering around my area today too. When I was working on the spinner, he came and started working on it.
Today I went to the back and we were alone and o told him I needed deodorant and he laughed and I said “I’m sorry tmi” and he smiled and was like “you’re good”.
Also today he bought something and he never rlly had before. I tried to talk him into buying something else snd he was like “I’m poor” so we were alone and talking at the register and he said something about the transaction and starts smiling and looking at me again.
He’ll easily make small talk with me now and today I said how a grilled cheese I ate was better than sex to my girl coworker and he was like “I make a mean grilled cheese”. I am a pretty girl who is around his age but I don’t want to automatically assume things because of that.
I don't know I’m starting to feel a weird vibe is he showing attraction to me? I want to know so I can know how to act towards him from now on lol.
Is this starting to get inappropriate?
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