Relationship

Hi my name is tony I'm from Australia I am going out with a girl
That is a snake.
Things are up and down like always for the past 8 yrs now.
Everything that I am reading about a snake is telling me that,
She is having an afair behind my back I do t know what
To believe? One day she can be happy the next she can be really nasty.
Just wanna ask what u think best thing to do?