1)if he breaks engagement girl can file police complaint against him for cheating under section 415 of IPC
2) she can also file suit for damages under section 73 and 74 of indian contract act
3) Damages for breach of promise to marry shall include not only material and pecuniary losses but also compensation for mental and moral suffering
4) boy cannot be forced to marry girl against his wishes . he should return all gifts received at time of engagement and offer to bear the expenses incurred by girls family