When Hec and Rachel were driving home from the dinner, why was Rach so moody? I guess she was thinking about Luce, but I still don't get most of the scene. Why did she want to go do it in the bushes and then get moody again when it didn't work out? She seemed very annoyed at Hec saying that sometimes he feels like he and Rachel just met. I guess I didn't get that whole scene. What was making Rachel so annoyed/happy/excited/moody in that short time span?
I took those scenes to be Rach's struggle with the end of her feelings for Hec, or her realisation that what she feels for him now is not really the "true love" she thought she had for him. She is moody in the car because she is so preoccupied with her guilt over her feelings for Luce, and the escapade in the woods was a desperate attempt to regain the feelings she had for Hec when they were first together, hence the whole 'remember that time when..." business. Obviously, that adventure failed miserably so she is even moodier than before. That's how I read it, anyway...
"I'm sort of having a good time doing the whole vulnerable whore thing."