Ben was slowly realizing that leaving Rita on Sunday afternoon hadn't just been the most difficult thing he'd ever done, but it also might have been a mistake. Though he'd left to avoid crowding her too soon, as everything she did, even a thing as simple as yawning, brought his emotions close to spilling; he was now wondering if it wouldn't have been better to just tell her and face the consequences.
If she rejected him, he would just pursue her as doggedly as she'd pursued him. She might have bargained for one night but she was getting forever. Ben had thought leaving was more reasonable, he didn't want her to think he was crazy. And since she hadn't mentioned his love declaration, spilled in a moment of weakness, he decided she hadn't heard and so he had more time to ease her into it.