I F21 being in a relationship am owner by another guy I met on Reddit and I’m his slut.

I’m in a relationship yet I obey another guy and does what he says. Ofcourse I met the guy here and I do everything he says me to do and obey him. He sends me stuff, which really don’t matter but just the idea of it. My boyfriend has no idea. Sometimes he asks me to not talk to my bf and I do it. It turns me on so much.