Keep it secret, but sometimes men say and do things wrong. They make mistakes, they choose the wrong option, and accidentally on purpose, sometimes they'll let you down. And when they've hurt you, or insulted you, or caused you upset, of course you're going to be angry with them and you have every right to be.
Because of that, it's important to know where to draw the line under an argument. When both sides have had their say and nothing's going to be gained by dragging it out, it's time to forgive and move on. If he's truly sorry, and there's no real harm done, then what a man really wants is forgiveness so you can both move back into a place of love and warmth. Don't sleep on arguments if you don't have to, and don't let little things drag on into the next day.