With of

However, sometimes we use of with feelings.

She was afraid of telling her mum.
I'm frightened of having an accident.
He's scared of flying.
You should be proud of your progress.

With to

We can use to to show the connection between people or things.

He's married to the director.
I'm addicted to my phone.
I'm allergic to nuts.
It's similar to the old one.

We can also use to to talk about someone's behaviour towards someone else.

They were really friendly to me.
Was he nice to you?
He is always polite to everyone.
She was very rude to the waitress.