Does playful teasing count as flirting?

My ex and I broke up a year and a half ago & we had texted a good bit in between then as friends. we just started working together and haven’t seen each other in a while, we were both glad to see eachother but while we were working he would playfully tease me about certain things several times and it felt kinda flirty which is weird bc I think he has a girlfriend i just haven’t asked. what do you guys think?

Does playful teasing count as flirting?
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