Is it more friendly or flirty to say "thank you sweetie (with two pink hearts) to a coworker you're close with?

So I was sitting beside my partner and he was on his phone and I saw a brief text with a female coworker that he's close with and I believe I saw something along the lines of "Thank you sweetie" with the two pink heart emojis. I'm not sure if he sent it or if she sent it. They work a lot with each other for sometimes long periods of time. I did ask him before if there were any romantic feelings with each other and he said there's not any romantic feelings between them

Friendly
Flirty
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Is it more friendly or flirty to say "thank you sweetie (with two pink hearts) to a coworker you're close with?
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