I've only once ended a friendship deliberately (some have ended because of distance, physical or otherwise). That was because she failed to respond to my message I sent her about my daughter, a woman she knew and had done her many favours in the past, picking her up and taking her places.
Daughter had been woken in early hours to a woman screaming outside our home. Daughter ran to woman's aid (she was being raped) and frightened the perpetrator off. It could have, so easily, ended badly for my daughter. I was playing "what if"in my mind, with thoughts of what could have happened, thoughts I couldnt/ wouldn't want to share with my daughter.
I told a couple of friends/family (who knew daughter) by email or text . All of them, with the exception of this one friend, replied straight away, asking how daughter was. This one friend didn't reply. When I checked she'd got my message, she said she had but she was too tired to respond.
Any way, perpetrator was arrested, thanks to daughter's evidence, pleaded guilty and daughter got a formal commendation from the judge.
It hurt me beyond measure to give this friend up, but I knew it was the correct thing to do. I'd be forever thinking whether or not she was genuine in our interaction after that, and that's no basis for a friendship.