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Biff went to Boston to catch up with his beloved father before his college visit. When he finds his father with another woman, he realises that Willy is truly a fake, and does not have thegreat qualities which Biff had formerly believed his father held.
Biff does not attend the summer school as he has given up on success - for himself and his family. His father's moral weakness reminds Biff of his own shortcomings - his proclivity to steal, for instance - and that his father's encouragement and faith in the family to succeed had no real foundation.