Settling down with Jeh would have been suicidal for piya. Jeh is nothing more than a teenage hormonal boy and his love wont last the test of time unlike abhay which has.
Abhay is just that much of nice guy that he probably wanted to give Jeh another chance but what did Jeh give in return? Death betrayal kidnapping of his betrothed. Abhay gave him a chance again for sake of alina and he just went ahead betraying abhay again. He deserves punishment and a very heavy one at that.