I chose Doug for a variety of reasons, first one being the radio sequence

the others being that after Carley saves your life the first time, she puts it in danger every other time.
She shoots a walker that Lee could've handled and causes more to find you, she thinks about going guns a blaze at the motel which would've certainly got you killed, and later thinks "hmm, I'm going to put my ammo in my purse, and leave my purse out of my reach, that's a great plan!", so I showed her how good of a plan it was and went for the guy who kept a good lookout, had great critical thinking with the televisions, and didn't know my secret