Is this parental alienation?

The mother of our child has told me she doesn't want me to be able to be alone with our child all of a sudden. She wants my mother to have to supervise the visitation I get. I have not done anything, don't do drugs or anything like that and I haven't got into any kind of legal trouble or trouble with our son but she started doing this when I got a new girlfriend. Funny thing is she has her boyfriend living with our son and I haven't even met the guy but I have to deal with it. Is she alienating me?

Is this parental alienation?
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