There are a few simple little things you can do to avoid this kind of
situation. Don't ever, ever, ever, for any reason, send personal email
to anyone other than your SO. Don't be out in public without your SO.
Just don't. Don't speak to anyone of the opposite sex when you are out
in public. Do not keep contact information for members of the opposite
sex. On receipt of phone number/email address, simply look confused,
crumple little piece of paper and leave it on the table.