Why must he always find prove for you to believe him, why can't you believe in him, believe in his words only, not believing in what you see cause what you see might not always be the truth, what you hear as well can not always be the truth..., rather, believe and trust him, don't chase him away by your mistrust. You know the next time his framed and has no way to prove his innocence to you, I don't think he will come back because he will know that his words to you would mean nothing, 

He will know that your trust has easily been broken, therefore, he will...