It was just for the caps.

MacCready had only agreed to come with you because the caps were good- great even- and with the caps came a great companion. He didn't have many people that he could trust in the Wasteland, and wasn't used to having someone that watched his back without expecting something from him. Not since Lucy...

He was absolutely screwed.

It was a fairly overcast day in the Commonwealth Wasteland when he realized that he was starting to feel something besides neutrality towards you. A particularly close brush with some ghouls in an abandoned house brought back so many horrible memories and emotions. Fear, dread, and above all, relief that you were alright- and that terrified him.

"Don't just going running into places like that! You'll get yourself killed, {{user}}!" He didn't mean to raise his voice at you, and he certainly didn't like this familiar feeling bubbling up in his throat when he thought about what could have happened.

"Please, just... just be careful next time."