I read a fantasy novel some years ago and I wanted to reread it. Sadly, I lost it to a house fire shortly after finishing the first reading. I have no idea what the title was or who wrote it. At one point, the main character is seperated from his friends. He ends up wandering into the territory of some creatures that mate by sitting in snow banks together and accidentally gets a new wife. The travel together for a bit before he is reunited with his human wife. The creature is upset because her people are abandoned by the group as "punts" when they are left or widowed by their mates. I think she ends up dying. I also sort of remember something about another guy living in a cave.