Had a girl hit on me hardcore even point out how pretty my gf is. we were talking back and forth she “set up a date” in her head. Us going to the beach. And said all this sexual shit. Then when I reciprocated she said “is this with or without the gf ? Two for one? Jk she’s pretty but I’m not into that”

I said oh I didn’t know you were the one to set up the first date. My bad.. But without unless you want her there since you keep saying how pretty she is.

How do I bypass them saying they aren’t into hooking up with people with a girlfriend