Boyfriend Caught His Sweet Babe With A Man, Leaks Her Nudé

I just wonder why some guys are taking relationship like marriage. No matter how much you love a girl once it is obvious that she is cheating on you, it simply means she is not ready to be with you as a responsible wife in the nearer future. So, just dump her and move on. But guys these days are taking it too far. Another pix..
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...but why are girls of today so unfaithful sef?