I can talk about exes.

何度かお願いしている素朴な先生と。

1. To dump someone means to break up with someone.

She’s thinking about dumping her boyfriend.

2. To stay friends means to continue being friends after a breakup or separation.

I think it’s best for us to break up, but I hope we can stay friends.

3. To be on good terms means you are able to interact well and be friendly with someone.

It’s hard to be on good terms with your ex-boyfriend.

bo on good terms は使っていきたい。