On Ghostbusters 2, when the bathtub attacked Oscar Dana stayed with Peter till things got sorted out. They were having a discussion on where to sleep, and they decided that Peter sleeps on the couch while Dana and Oscar sleep on his bed. I mean what right does she have to call the shots. It is his apartment for crying out loud. So she should stay on the couch while he sleeps in the bed. He is doing her a favor after all.

It's a movie and he's not an asshole.

KansasCityGB;171806
It's a movie and he's not an asshole.

Exactly. Peter would like to have their relationship be at the point where they'd both share the bed, but after having drifted apart for so long and her having moved on in her life, Dana wasn't comfortable with that happening so soon after the ending of her marriage.