ないではいられないCannot help doing something, Cannot resist doing something

In order to express that something cannot be helped or cannot be resisted in Japanese, the phrase ないではいられない will be used. This is a structure that is comprised of verbs in the negative form connected to で, は, and the negative-potential form of the る-Verb 居(い)る 'to be'. In this way it just means 'to be unable to be without (A)'.

ないではいられない primarily expresses the inability of the speaker to tolerate (A) not happening, due to wanting to do it. It may also indicate that they will unfortunately do it despite knowing that they shouldn't.

ないではいられない may also be used to highlight that in the situation of (A), some particular emotion, feeling, or reaction cannot be repressed. (B) is something that happens naturally as a consequence of (A).