Honestly, it really would have been kind of “wasteful” to have a big emotional goodbye since she wasn’t going to be able to remember any of it anyway. I think their “moment” made it clear to each other how they feel about each other. But consider the situation, there was a lot of stuff going down and everyone’s emotions were all over the place. They had only minutes to get out across the town line and Regina had only minutes to inact the counter curse. It would have been overwhelming to say the least. I’m amazed she made it through without vomiting – that would have me, puking all over Hook’s boots from how emotionally sick the whole experience would have made me – right before I passed out.