This is an unexpected development in their relationship. Being nice to him is one thing; showing vulnerability and snuggling up next to him on the couch sets off alarms. -- But there's no mistletoe drying up around them, even as he double checks to make sure. She's really just drunk.

"It's probably worse than getting a divorce, huh?" Subtly reminding her of that might be the best way to go, although he doesn't move away. Or answer her question. He does that.