Iphone 5 deleting conversations?

My iphone 5 has been deleting my imessages with two specific contacts only. Every time I go to send those two contacts a text, I have to start a whole new conversation. They both have iphones as well, and I'm not sure why it is deleting on its own. Does anyone else have this problem?

Why would you do that.

You need 2 stop deleting them

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