行かなくてもいいよ

you don't have to go

→ 行く
phrase Rare #24,313
you don't have to go A casual way to reassure someone that going is not necessary. The ending よ adds emphasis or reassurance.
JA: 疲れているなら、今日は行かなくてもいいよ。
EN: If you're tired, you don't have to go today.

行きたくないんだったら行かなくてもいいよ

If you don't want to go, you don't have to.

行かなくてもいいよ

You don't have to go.

ダンスパーティーに行きたくないなら行かなくてもいいよ

If you don't want to go to the dance party, you don't have to.

来週ボストン行かなくてもいいよ

You don't have to go to Boston next week.