Why is there such an awkward vibe between us now?

Helloeriss01
This guy does know I am dating someone because I always talk about him.
He’ll tell me hey and “welcome to work” and stuff 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 is 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 i told him and it ended up being somewhere else and he was like “you lied” and was smiling.
I came in and I looked overwhelmed because of the sale and he looked at me and asked was I ok. He also kept saying random things to make small talk. He keeps lingering around my area too. When I was working on the spinner, he came and started working on it.
I went to the back and we were alone and i 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 he bought something and he never rlly had before. so we were alone and talking at the register and he said something about the transaction and starts smiling.
Once I told someone else “is there something wrong with our manager? She’s always working.” And he overheard and laughed. Also this one customer was kinda rude and he intervened and defended me.
I said how a grilled cheese I ate was better than sex and he was like “I make a mean grilled cheese”. I am a pretty girl who is around his age but it doesn’t matter.
I hadn’t seen him in a while and saw him today. He kept coming near me but I didn’t think too much of it. I got to leave early and went to the back and I guess he saw me and came to the back too. We were alone. He asked if I was leaving and as I was clocking out he asked how my New Years was but he kept lingering it was rlly awkward lol so I asked him if he was on his break and he said he wasn’t and kinda laughed.
I felt an incredibly awkward vibe. Why? Lol
Why is there such an awkward vibe between us now?
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