In reality, most conflict between people are not really between those two. It's an internal conflict with the person who picked the fight. I normally just let things roll off my back. If someone says truly hurtful things to me (which happens more than you'd think) I don't let them see my hurt. Yes, your words and actions do hurt me. I am a very sensitive person. But, I will only let those emotions come out in private.
Whatever your friend, lover, boy/girlfriend or spouse is going through, my feelings are minuscule in comparison. I will be over it quickly. But, your feelings may not heal for some time. I don't want to compound the situation with me lashing back to you.
So, the moral of the story is that you should forgive and forget. Holding onto things to throw back into your partners face is only toxic. It will not lead anywhere I want to go. But, I may be an anomaly.
I hope you're doing well and enjoy my ramblings. If not, let me know. We will still be pals! Talk to me soon!