Didn't read the OP.
Walk her to her car, the train, her cab, whatever and kiss her passionately and smack her on the ass and mouth off the first thing that comes to your mind
"text me when you get home safe"
"I enjoyed spending time with you"
"Be safe out there"
and walk away. No need to make it complicated. I've done this to girls I have fucked, not fucked, broken up with as a goodbye, doesn't matter. It feels good to me so I do it, that's what matters.
Walk her to her car, the train, her cab, whatever and kiss her passionately and smack her on the ass and mouth off the first thing that comes to your mind
"text me when you get home safe"
"I enjoyed spending time with you"
"Be safe out there"
and walk away. No need to make it complicated. I've done this to girls I have fucked, not fucked, broken up with as a goodbye, doesn't matter. It feels good to me so I do it, that's what matters.