How can I prove my fiance stole my phone with all my info and is still using it to get into my X email and iPhone?

How can I prove my fiance stole my phone with all my info and is still using it to get into my X email and iPhone?

My question is why do you care so much?

You could probably set um up and make a new email and exchange some juicy stuff with yourself. See if there's a reaction.

Tell police to track your phone

Did you enable Find My iPhone (or the equivalent on Android)? Sign in to iCloud (etc.). The location from the last time the phone was seen will appear, and you can remotely lock or wipe it if you wish.

Also, change all your passwords.

You may not be able to prove it, and if she's Still your fiancee. I think you have a major problem.