I kinda feel bad for the Colonel.. He doesn't know if Nuka is dead or not, or if he got abducted or ran away, and if he run away, that probably feel worse, since they've been getting along well.
Nuka, in my opinion, definitely got manipulated by Silas to run away.. He was shown a clip, then got told that everything is ready for him so he can run away immediately. Bro wasn't even given time to actually think about it.
I hope he thinks about it now. Maybe he have time to think things through now, right? Though I doubt it'll result to a positive one, since he's in the enemy camp so their views will definitely influence his thoughts.
Bro is acting like he didn't ghost her for 10 fckng years.