How to remove iCloud from Mac Computer?

My boyfriend had hooked his iPhone up to his now ex girlfriends computer. Since then they've broken up but she can still access his iMessages. How do you remove it without him shutting off his iCloud completely or changing his phone number?

Without access to that computer, you don't.

On the iPhone go to settings > iCloud and disable all other users. Or go to settings > iMessage and disable any other devices being linked. Or ask your boyfriend to ask his ex girlfriend to unlink it from her iMac herself, that would be easiest. In the mean time if he switches of his iMessage on his iPhone and any other Apple device he has then she can't check his messages. Tell him to ask Apple support online to talk him through it step by step

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