改变主意了

changed one’s mind

→ 改变
phrase Rare #19,209
changed one’s mind 了 indicates that the change has happened; the subject is understood from context.
CH: 我改变主意了,不去了。
EN: I changed my mind; I’m not going.

你要是改变主意了你就给我打个电话好吗

If you change your mind, give me a call, okay?

— Dying to Survive (2018)

改变主意了吗?

Have you changed your mind?

— 惊魂记 (1960)

我下次来再看看你是否改变主意了

I'll check next time I come to see if you've changed your mind.

— 潜水钟与蝴蝶 (2007)

还是你改变主意了

So, you've changed your mind after all.

— 完美陌生人 (2016)

我改变主意了

I changed my mind.

— 乔乔的异想世界 (2019)

但是我已经改变主意了

But I've changed my mind.

— 回归 (2006)

如果你改变主意了

If you change your mind

— 完美陌生人 (2016)