How was this traced from another Iphone?

I've got a add on contract to my sisters Iphone. Sent an IMessage to my girlfriend 3 weeks ago. I didn't think they were traceable but my sister plugged her iphone into the computer and somehow found my message to my girlfriend on there and could read it as well? It was only one message she could see though… We send iMessages all day. How on earth was it traced?! And withheld calls were listed as well? How the hell?

Through iCloud on your Apple ID turn your iMessages off n just text or what'sapp. Alternatively change your settings so your message don't sync to that device

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