I don't want him touching me

I'm 36+3 and my SO and I never have sex, which is fine with me lol. But then he'll come up behind me and grab my boobs or my butt and I just freak out. Like I just want my own space right now. I'm totally okay with him touching me elsewhere but nothing sexually. Plus my nipples are so sensitive and I just get so annoyed when I tell him please don't and he still does it. I feel like a bitch but I can't help it. Anyone else? 😫