Can this person see my data?!!?

A friend of mine knows my Apple ID and password, and their email is set as my verification email. I removed their email yesterday it realised they know mY ID and password, will they be able to see my iMessages because of this? Because on my actual iPhone the devices listed are only those that are mine and my iMessages is only connected to my devices. Is it possibly they can still see the messages somehow?? Please help

nop they can't see your messages. They are encrypted to your devices. However, please change your password to remove any doubts. cheers