How to get over a best friend

Me and my best friend have been friends for 2-3 years. Every time we have a disagreement she ends our friendship.

I don’t like feeling under valued in a friendship and I don’t like feeling dropped at the top of a hat.

I also understand her perspective.

She says “every time we have a disagreement I can only see all our disagreements from the past”

Today she ended our friendship. Like we had a in depth conversation that left me in tears and it’s over, feels like a breakup.

Mind you, I’m 28.

It hurts and no matter how hard I try to save our friendship I need to let it go.

It’s shocking to me how easy it is for someone to drop a friendship basically over nothing so easily?

Any advise helps