god this happened to me and was so bad i pretty much just mentally retconned it out of my character's history and never brought it up again

worse, people treated my character like the worse person for holding a grudge against A. people even OOCly got upset at me for saying that B wouldn't attend a birthday party A was invited to a week after the incident happened, because apparently being uninvited from a birthday party would be too harsh of a consequence for a murder plot and would make A's player miserable.