What does Brian do when he feels lonely?

From the text:

And he was, at that moment, almost overcome with self-pity. He was dirty and starving and bitten and hurt and lonely and ugly and afraid and so completely miserable that it was like being in a pit, a dark, deep pit with no way out. He sat back on the bank and fought crying.

Then let it come and cried for perhaps three, four minutes. Long tears, self-pity tears, wasted tears.