I’m inlove with a guy that has a girlfriend. What should I do?

The guy is 10 years older than me and he has a girlfriend. They’re sharing the same home and has been in a relationship for 8 years. I dont know what i should do. Should i give up on him or should i continue flirting and hitting on him? I have a strong attraction to this man.
I’m inlove with a guy that has a girlfriend. What should I do?
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