[Lothiriel Silmarien]

That's tricky cuz Turin and Nienor were good for each other because they loved each other so much, but they were brother and sister so that's just obviously not good. Eol and Aredhel didn't have a good marriage and same with Erendis and Aldarion, but I'm trying to think of some others too. I'm probably wrong here, but I just never felt that Arwen really loved Aragorn. I know he loved her and she must have loved him to give up her immortality but it doesn't say much about their marriage and I just felt for some reason that she didn't like her life with him. But that's just me, and I think there must be something wrong with that!