Plate invited me to a party at her place. When I got there, she was leaning on a guy (basically in his lap) and she quickly stepped away when she saw me.

She knows I'm not exclusive with her and she's told me that she doesn't want to see anyone else (yeah, right).

So how should I handle this? Should I act like I didn't even see anything for tonight, and then downgrade her? Next her? Or just blow her off completely tonight?

I should note that this girl is basically my bottom bitch (and I think she knows this, which is my fault), so I feel like it's pretty disrespectful (not to mention stupid) of her to do that.

Part of me wants to just next her on principle, but another part of me doesn't care what she does as long as she fucks me when I want her to.

Still kinda new to plating, so I'm not sure what to do but I definitely don't want to portray myself as beta.