That's because losing consciousness "generally" implies losing your mind as well (e.g. when dying). But those are only special cases. For god's sake, you are unconscious every damn night, yet you don't struggle to avoid that, and you don't struggle because you know that on the next morning, another consciousness will run on that mind.
and im arguing its impossible for multiple minds to share the same consciousness.
the consciousness that wakes up in the morning is the same one that went to rest when i fell asleep, and the same one that may have been dreaming when i was sleeping. Not some new one that replaced the one that died when i slept.
hopefully we diverge so he doesnt think like me.
I plan on pretending to cooperate with the guy so we can escape, us against the world, and then stabbing him through the heart when hes most vulnerable/unaware. Then i'll no longer need to run and hide, since there is no longer a duplicate, and one of us is dead.
Hint: This is his plan too. 
yea i was hoping he'd diverge and change to be a better person during the time we spent together, or perhaps become bonded to me as a kindred spirit or soulmate.
Who knows maybe i'll be the weak one and let me guard down first...
i think i might cry after stabbing him, and he might just smile sadly and tell me to enjoy my life and freedom before dieing...goddammit