And he's the most likely one to do such a thing.
"I haven't done anything excessive to you since the first time we met. What makes you certain it's me?"
"You do have a point, but... you're the prime suspect," before he could look flustered, Eleven added hastily, "But I know now, it's not you."
"Not me again? Is it so impossible that I would have someone kidnap you and then save you, acting like I just happened to pass by, to make you feel affectionate toward me?"
Eleven laughed, "How could that be? Isn't such a scheme risky? Under such circumstances, I am most likely to fall off. The culprit did not expect that I would be so well-behaved in my sleep, not even turning over. That I didn't fall off and get killed is my good luck. Alternatively, if I had died, what kind of affection could I possibly harbor for you?"
Her reasoning is clear.