How do I sign out of all devices currently using my Apple ID? I have an ex that is using my Apple ID, and I want to get him off my account. I have changed my password, but as he was already signed in, it appears that he is still using my account. 

I remember once in the past when I changed my password, I was given the option to sign out of all devices currently using that Apple ID, but that option seems to have disappeared.
Go to https://www.icloud.com/#settings &amp; hit "Sign out of all browsers' then change your password again.