Possessive and obsessive wife

I have been married for almost 2 years to my wife, however even before we got married she started showing this side of her which she said would get better after getting married. But now, it’s only gotten worse, every day I am being accused of cheating and flirting with other women. It’s getting to the point where it’s driving me insane and thinking of leaving her. I have never cheated on her, is there anything I can do to make her stop acting this way?