Why can my girlfriend read all my private messages on Facebook?

[The D]

Since a couple of weeks my girlfriend is able to read all my private messages that I send to other friends. She can exactly see what, when and how I sent something to my friends in private chat. She can also read posts in some of my groups in which she is not a member of. Is there any way I can prevent this?

[Tom]

Change your Facebook email address, password and don't store the password anywhere on your computer. If she has access to your computer make sure you uncheck the 'keep me logged in' box. There is no way she can see unless she's signed into your Facebook somehow.

[Daniel]

She Can Read your Private Messages Because She Is In your Facebook to Stop This Change your password

[Mimi]

It will repeat again after you change your Facebook passsword IF you don't clean your cookies and browser history after you change it.Do that in all browser you use (Firefox,IE,Safari).Change the settings of the browser to prevent it from storing passwords...