にはいられない

can't help but

→ に
phrase Common #4,436
can't help but Usually appears as part of ずにはいられない, meaning that someone cannot stop themselves from doing something.
JA: その映画を見ると、泣かずにはいられない。
EN: I can't help crying when I watch that movie.

彼女を笑わずにはいられない。

I can't help laughing at her.

彼女は欠点だらけだけど、好きにならずにはいられない。

She’s full of flaws, but I can’t help loving her.

彼女の冗談は笑わずにはいられない。

You can't help laughing at her jokes.