Is it wrong to be his side girl?

someone717267271
So i like to flirt with this guy who is 28 years old and im 18. He has a 9 year old relationship and he has lived with his girlfriend for 3,4 years. He’s my crush and i haven’t obviously met his girlfriend but i like to flirt with him for fun. And i have a crush on him. I feel like he enjoys that i have a crush on him and find it fun. Can i be his “side girl”? Like only for fun even tho he has girlfriend? Without her finding out obviously
Is it wrong to be his side girl?
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