My iphone facebook app keeps signing me out?

Everytime i exit the app on my phone and go back to the app it makes me put in my email and password, but it will not stay logged in, but i went on my girlfriends facebook on my phone and it stayed logged in perfectly and nothing was wrong so it must be my settings or something but i can't figure this out, Please Help! It is getting very annoying

You need to click on a box that either says "Stay logged in", or "Save Password". Sadly, this is my only advice, I don't have any other info on the matter.

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