Android app can track my boyfriend's Viber.

I'm searching a android app which lets me monitoring my boyfriend's Viber. Because yesterday, when I unwittingly saw his smartphone screen, a strange Viber account was chatting with him. That stranger call my boyfriend "babae" and using so many sweet icons. So I doubt that there's a girl out there wants to seduce him.

So anyone pls recommend me the easiest way to track my boyfriend' Viber

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