Obviously, the reasons for breaking up varied a lot over the years and it seemed that they might have had their differences, but they were trying to work them out.
This year, however, when they broke up for good, many people were surprised and wondered what was behind the split.
As it turns out, they may have been fighting over starting a family.
According to Perez Hilton, Rihanna was already considering marriage and starting a family and Chris wasn't all too interested in that idea.
Of course, we're not marriage counselors, but with their tumultuous history, it probably would be a good thing to wait and see if things stabilized in the future before making that kind of decision.
Then again, it wouldn't be the first time we've seen someone get married when it isn't completely blissful, either.
Do you think Chris and Rihanna will end up getting married eventually?
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Gallery | Biggest Celeb Break-Ups of the Year!