She's not fine with it. She's trying hard to look "aloof".
You played it well.
It's fine to GAL. In my opinion, you didn't lie to her, you tried to deceive her intp thinking you went on a date.
She has no case that you slept with someone else. You can always tell the truth and tell her where you went. You don't need to share the part about staying in your car -- that's a litle pathetic. ;-)
