Aibu - to be frustrated with the invasion of my privacy

[Pregnantbean1]

A bit of background my mother has been with her partner about 4 years I've only known him just over 2 years since I got pregnant with my son, since I've met him he has been very controlling to the point where I was forced to move to an entirely different town away from my friends because he decided my mother and i were moving any time i protested i was called selfish and told by him i was keeping my child from my mother. I gave in and now live nearby them

But recently he has started going through my rubbish and recycling commenting on what I eat and trying to tell me what to do and where to take ds everyday even if ds and I have plans, it's becoming suffocating what do I do?

It sounds like he is obsessed with you and/or your son. He has a very worrying fixation with you and, while I really don't want to cause unnecessary alarm, nobody knows where this obsession will lead.
Looking through your bins for what, exactly? Evidence of a partner? Evidence that you are making plans to move yourself and your son away? I just can't imagine what he is hoping to gain from it. Other than control and fear of course. I hope you get the support you and your mum need. Take care and the best of luck.