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i dont think its necessarily a trust thing - i would not have liked my partner to look through my phone, not because i was cheating etc - i wasnt - or chatting to other blokes even as friends, but more because i speak to my friends freely about him and others, and may have said something he would not like me to say, told them about an argument, moaned about his mum or friend, commented about a bloke who tried to chat me up who i turned down, or even about womens problems etc - all stuff that may not go down very well
he is fiercely private and hates me talking to anyone about him, but of course im going to, thats what people do with their mates, so even though only on some occasions what i have said would be bad - after a row or something - he would not like even the most minor of comments.
aside from that, its just private really - not secret - but private, you wouldnt be happy to discover your phone had been bugged, and someone was listening, or reading all your emails and mail etc