How to deal with your partners parents?

So I've been having issues with my mans mother. She has been trying to but into our relationship telling me he told her to ask me for money, or that he's talking to other people when I know that he isn't. Him and I have a solid foundation and that bugs the shit out of her and she keeps trying to push me away. I'm conflicted on how to handle this situation. A part of me wants to go off on her and give her a piece of my mind, the other part of me wants to be the bigger person and let it go. What would you do?

Confront the situation
Let it go
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How to deal with your partners parents?
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