Why else does Liselotte Vitzliputzli reveal to Dunstan about his nature?

Liesel tells Dunstan that he is like a little boy:

You are just like a little boy, Ramsay. Or no, I am forgetting that only silly men like to be told they are like little boys. Very well, you are like a man of fifty whose bottled-up feelings have burst their bottle and splashed glass and acid everywhere. That is why I called you a little boy,

Liesel says Dunstan's problem is that he watches life from the sidelines, watching life from the sidelines and knowing where all the players go wrong. Life is a spectator sport to you.