Ok this might sound really 'off the wall' but when I was around my bfs flat once, I failed to log out of my email properly and said bf not only read my emails but copieds some to his own account as he really didn't like what he read (this was stuff re our split-up which was less than amicable). He kept them in case my DD's father comes back in x years time and makes out like we're one big happy family.... and he can take steps....
This only came to light the other week or so. I've natually dumped him for breaching my privacy/trust like this (and learnt a valuable lesson myself: ALWAYS LOG OUT AND CLOSE YOUR BROWSER even with people you think you can trust) but is there any way I can get him to delete the emails -- other than literally standing over him??! And even then that isn't foolproof as he may have made multiple copies.......!!!!