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こうなったら

if things have come to this

→ こう
phrase Rare #37,522
if things have come to this Often introduces a decision or response made in light of the situation, sometimes with a resigned or determined tone.
JA: こうなったら、最後までやるしかない。
EN: If things have come to this, I have no choice but to see it through.

こうなったら

If that happens,

— Sanjuro (1962)

ジジこうなったら最後の手段よ

Jiji, if it comes to this, we’ll have to use our last resort.

— 魔女の宅急便 (1989)

こうなったらそれもいいでしょう

If that's how things are, I guess that's fine too.

— Sanjuro (1962)

ばか野郎こうなったらおとなしく捕まるほかねえ

You idiot. At this point, I’ve got no choice but to let them take me in.

— Sanjuro (1962)

こうなったらおとなしく捕まるほかねえ

Now that it’s come to this, I guess I have no choice but to go quietly.

— Sanjuro (1962)