I don't know what to title this

How do you reassure yourself that removing yourself from a friendship is okay, even when you don't want to do it? mentally and emotionally it's not serving me and being in it makes me re think certain conversations or I'll want to express things that I feel I'm not supposed to cause it's not that kind of close relationship anymore. I feel as if I just struggle each time I decide to reach out again. How does one stop themselves from reaching out without blocking their number? I want to just be able to use my phone without this need to turn it off cause it removes what gives me stress. I am also still used to telling them why I need to remove myself, which also annoys me because I can never just do something for myself without saying anything.