Why does Bigger deciede to go visit Bessie?

Besides the animalistic desire to go and have sexual intercourse with Bessie, it seems that Bigger is interested in finding a way to devote himself to someone else as a way of forgetting his own guilt. This turns out to be a mistake, however, as Bessie is mostly concerned with Bigger's newfound cash wad--which only leads to more intense feelings of helplessness and guilt.