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話さなきゃ

have to talk, must tell

→ 話す
話さ to speak, to talk + なきゃ Must / have to (colloquial)
verb · necessitative Rare #37,126
have to talk, must tell Colloquial contraction of 話さなければならない or 話さなくてはいけない.
JA: 先生に本当のことを話さなきゃ。
EN: I have to tell the teacher the truth.
Conjugation of 話す
Necessitative
話すべき話さなきゃ

リノと話さなきゃどうすべきか分かるはず

You should know what to do if you don’t talk to Rino.

— アイム・スティル・ヒア (2024)

ここではフランス語を話さなきゃだめだよ。

You have to speak French here.

話さなきゃだめじゃない！

You have to say something!

— 箪笥＜たんす＞ (2003)

人の気持ち考えて話さなきゃダメよ。

You need to think about other people's feelings when you talk.