Not enough people understand the extent the chip is affecting Caleb.
Do you remember Caleb's first reappearance in the main story when someone tried to assassinate him? Or when he was speaking to Joseph in the very next chapter? His tone wasn't icy and his flippant behavior wasn't because of composure. He literally just felt 𝘯𝘰𝘵𝘩𝘪𝘯𝘨 in these moments.
Personally, I believe Caleb is no longer capable of feeling emotions for anything at all unless it relates to Mc.
Caleb was walking around Skyhaven after he supposedly died in a dissociative state. Signing paperwork? His hand is moving on its own his eyes reading the words while his mind is a thousand miles away. He takes orders like a living corpse while numb to the world around him. He handles losing his arm so well because his body doesn't have the capacity to care for things like that anymore.
The seven percent left of Caleb's brain is composed of nothing but Mc. She's the only thing left reminding him he's alive and not a puppet on strings like the rest of the fleet. Spending time with her, reminiscing, or dealing with the pests that dare pose a threat to Mc? These are the only things left he has to spark his emotions.
If you were walking around half dead like Caleb wouldn't you also be a little selfish with the only person or thing left that can make you feel something, anything at all?