Letting go vs holding a grudge

So when someone loses their temper with you to an extreme level more than a couple times, what should you do?
I know there are a few reasons to stop spending time with someone like when they trigger you often or make you feel less than because of your diagnosis. But what if someone has a reason to be irritated by you because of something small you did do wrong (and you're very apologetic and willing to fix things) and they severely overreact often and lose their temper with you to the point of demeaning you and making sweeping negative generalizations about you. If this person is someone you've always been very close to but they've become curt with you and very intolerant.
I mean if they affect your mental health in a negative way does that mean the relationship is no longer viable? How do you know where to draw the line when someone constantly makes you feel like a bad person because of small mistakes. And I mean these mistakes don't even really affect this person who is being so judgemental.
I've been experiencing this with someone and they wait a couple days then all of the sudden they're trying to start a friendly conversation with you like they're over it and you should just let it go and pretend like nothing happened in the first place. Problem is, I'm feeling vulnerable and insecure around this person now. and I'm still angry that they said some really mean stuff when I was already in a low place.
So frustrated and don't know how to respond. If this person is important to me is it worth sacrificing my mood and extreme emotions in order to just smooth everything over?

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Sounds like this person may have become toxic to your mental health. There is only so much abuse a person should take and I would say you've had enough negativty from this person. I would say it's time to cut ties, which is never easy to do.

It sounds like this person has problems and maybe their problems have nothing to do with you. I don't know. Maybe you should stay away for them awhile and see what happens. Maybe you should let them go. I can't tell you what to do. But if the abuse continues it may be time to let them go. You don't need someone in your life who treats you like that.

As far as grudges go, I think it's better to forgive. I saw something on Facebook: "holding a grudge is like letting someone live rent free in your head". Grudges only hurt you - the other person doesn't care. Forgive but don't forget - that's my motto.