Dating a guy who is taken?

I am seeing a guy 11 years older than me and has a 3 year long relationship with someone else. He is waiting for the car in his name but he is also going on vacation with her. He says they haven't slept together for 3 years. Bullshit? He is gonna leave her for me as if I want this trash. He tries so hard to hide it from her.
Dating a guy who is taken?
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