My mother always assumes really weird things about me

So I am in my 30s. As a teen and young adult I had some strain with my mom but we are close now and talk every day even though we live in different states. Growing up she always assumed odd things about me. Like she would accuse me of stealing from her if something went missing around the house, odd things like a spoon or candle. She’d ask me if I cheated if I ever brought home a good grade. If I had a close male friend she would ask me if we were boyfriend and girlfriend and wouldn’t believe me if I said we were just friends. If I had a close girl friend she would ask me if I was a lesbian and not believe me when I said no. She always had this expression like I was lying. In my adulthood when I tell her things she acts like she doesn’t believe me. Like once when my husband was deployed, I was texting a friend and she said “are you texting another man?” insinuating I was somehow cheating on my husband. Then she said I am always “after attention and men” which I’m not nor have I ever been. I’ve always been kind of a prude, haha.

Anyone with experience in psychology, can you tell me why someone would be this way? Always assuming someone else is lying or being sneaky/shady?