It was only the other night everything was fine and the next thing I know I'm drowning. How many times can a man go down and still be alive?

I can't breathe. There's Beatty dead, and he was my friend once, and there's Millie gone, I thought she was my wife, but now I don't know. And the house all burnt. And my job gone and myself on the run, and I planted a book in a fireman's house on the way

Why does montag questioning himself that way and is he guilty ?