As jbeachy mentioned, if your recipients are BB users, it is possibly *their* settings that keeps a history. It is normal on a BB (also a Treo, not sure about other phones) to keep a history of the conversation. So when you get a new text, it will automatically show the past conversation, until you clear it. If this is the case, they should know this, however.
Having said that... I had this happen to me once with another phone (regular flip phone, not BB). It fixed itself after a day or two. I am fairly positive, there is no setting that would send the entire history of the conversation to the recipient. That's just silly.
I do believe you have found a solution!!!!!!!!!!!!!!! He cleared it out and they are gone!!!!!!!!!!!! So, as I thought all along it was me, it was them They did not clear their SMS inbox out! Thank you so much everyone for your help...I know I will be back with more questions THANKS!!
count me in too!!, I have the tour and when some people send me new text messages I read what I wrote a month ago and it's the same 3 particular sentences, I have deleted the call history, took battery out, they to have said they have not saved the message to there phone nor can they see what I am talking about!!,,Pleassseeee can anyone help me??