I have friends of mine who check through my personal stuff like mobile messages, wallet, bags and things like that. i also have friends' partners who check in their mob. messages or even facebook messages or email messages or messenger contacts. how normal is that to you? has it ever happened to you? personally, in both cases i find it as a lack of respect and privacy and can't put up with this. if your partner wants to cheat on you and made up his/her mind about this, he/she will find a way or another and not necessarily having you going through his/her personal stuff.