Why are contacts showing up twice under messages on my iPhone?

This morning when my boyfriend sent me a text it showed up under a second listing of his name instead of the one already in my messages. They are listed exactly the same, but one only contains messages from this morning. Why is it doing this/how do I fix it? I have an iPhone 4 running iOS6 that hasn't been updated since that came out in the fall. My email contacts aren't synced to my phone, so that can't be the cause.

It could be the message cache under you boyfriend's name is full and need to open a new fresh cache and if this is happening with several contacts then there must be a duplicate conflict.

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