Back before they run away, Bart watches Artemis from afar. He knows she's having a difficult time. He also knows Dick is as well. People are always going to check up on the two.
They both resent that, Bart can tell.
Bart himself is approached multiple times by his friends, his family. They all worry about him. About how he's "taking it".
Bart feels like screaming at them all.
But, he doesn't.
He is silent.