If you want to cut off a friendship because it just isn’t working for you, that’s fine and dandy, but if this person wasn’t abusive and wouldn’t know what was wrong unless you told them, at least give them an explanation. It can be incredibly damaging to someone’s mental health to just be deleted from someone’s life like that with no explanation whatsoever. Also, be honest. Don’t make excuses, don’t lie out of your ass, just tell the truth. Because honestly this kind of thing has happened to me and several friends of mine way too often and it needs to stop.