please i need help? please?

it's about a boy and a girl. the name of the boy is 'madi' and the name of the girl is 'efa'. it all started 2 years ago. madi and efa used to read in the same school. Efa went abroad for higher studies and realized that she loved Madi. so one day while chatting with madi she told him that she loved him very much. madi said he would wait for her. 2 years went by ...Efa came back to the country where Madi lives. Madi's happiness knew no bound. but efa was different. she changed a lot. madi called her several times but she didn't recieve. one day a guy called madi and told him not to call efa again. madi was surprised and asked him who he was. the guy told him to ask efa for the answer. madi called efa and she recieved the call for the first time and told him that ..that guy was her boy friend. she met him in bangkok (where is went for higher study). she told madi to forget her and it will b good for him.
what do madi do now? madi had been waiting for her for the last 2 years.
efa could have told madi everything before coming back to the country. why did she cheat on madi? why did she lie even before the day she arrived?