にはいられない

can't help but

→ に
phrase Common #4,866
can't help but Usually used as 〜ずにはいられない or 〜ないではいられない, meaning that someone cannot stop themselves from doing something. The example sentences 1 and 2 use に は いない, a different expression meaning “is not in” or “is not at.”
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.

彼女の冗談は笑わずにはいられない

You can't help laughing at her jokes.

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.

泣かずにはいられない

I can't help but cry.

彼女を笑わずにはいられない

I can't help laughing at her.