Dhruv should be blame for making Alisha pregnant. Alisha come from Canada, a liberal country where not every couple is married, so she cant b blame to have cross her limit.
On the other hand, Dhruv, althg he didnt remember his name n family, he didnt forget speakg hindi, so how can he has forget abt his culture? he as a responsible person, should know wat he was doing, and didnt he proposed Alisha to marry him?
Even with Arti, Dhruv did bewafaa as he did marry but later left her.