What happened in boston, what do we find out is the problem, he secret between willy and biff?

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.