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young Nathan: This is your fault. You neglected to do your duty.
old Nathan: You are wrong. They could go back with that knowledge and be better.

(20 years from now)Warren: We should have gone...

I think the young Cable is the old one himself. Or I hope so. He's so cuuuute!!(I mean if they are the same person.)

I agree. Maybe Cable's death can rekindle their relationship. But will Scott return this time?