君は僕に

you … me

→ 君
phrase Rare #45,314
you … me 君は marks “you” as the topic, while 僕に means “to me” or “for me.” The exact relationship depends on the verb or expression that follows.
JA: 君は僕に何をしてほしいの?
EN: What do you want me to do for you?

君は僕に電話する必要はない。

You don't need to call me.

君は僕にとてもいらいらしている。

You’re very annoyed with me.

なぜ君は僕に冷たいんだい?

Why are you so cold to me?