How to find used password on messenger? LG G3

[Android Central Question]

Hey guys!!
I have some problems. Maybe anyone have a solution.
I broke with my gilfriend and she was signed on messinger on my phone.
I know that, it's possible to find password in data files or somewhere else.
I would be grateful if anyone can help my
Phone, of course, Lg G3 d855.

 

[belodion]

You want to know her password?

 

[Duokim garo]

Yeah