being triggered

so yesterday my friend said a bunch of triggering things to me and i am still trying to get over it honestly it has brought up so many bad memories for me and has really set me off. sadly i cannot tell my friend this or they will be upset with me. also they did something a bit like manipulative and idk how i feel about it basically they didnt get what they wanted from a situation and so then they went a self harmed to try and prove a point to the people who didnt give them what they wanted and like idk it just gives me bad vibes like i get that they were probably feeling desperate but they could have done something else to get their point across and idk i am just feeling really over everything at this point maybe i am only feeling this way because of all the triggering stuff before that idk anyway idk what to do.