what is the incident that caused mrs.havisham to stop her clock and become a recluse ?

Miss Havisham is engaged to be married. On her wedding day, her fiance tells her the wedding will not happen - the time she stops the clock is the time he gives her that news. Her desire to bring Estella and Pip together is motivated by her desire to "control" the destiny of these two young people; she also sees how Estella could break Pip's heart because of the way Miss Havisham has "trained" Estella.