Is it wrong to flirt with taken men?

I have a crush on this guy, i’m 18 and he’s 28. I flirt a lot but he never put a ”line”. I feel like he likes that i’m flirting with him, i look good and have a sexy fit body. This guy is the top fighter and sometimes train me at the thaiboxing gym i train in. Is it wrong to continue flirting with him? Or what do you do in my situation? I like him and i have feelings for him and i feel like he knowd that because i flirt a lot. What should i do? I
Is it wrong to flirt with taken men?
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