Given the trauma-esq nature of triggers and the fact that it was mother's day and any type of relationship that has to do with mother's, especially given your mother's suicide, is bound to upset the delicate balance in the mind. Is that truly self sabotage or is it that nobody *maybe you included* doesn't understand that it is painful to watch mother;s day honours being doled out. So many things can come into play.Yes it's hard to feel like I am any 'gift', personally. Actually impossible.
I need to ask here, if someone had not played into the bait of arguing (which is protective behaviour it sounds like), then is it possible this could have been avoided? Does he understand you have PTSD? Does he understand the nature of reactivity?