1. Sur will not accept kripa as her mother and prateek won't accept angad as his father because they never really considered them their parents
2. When they eventually do...pritvi will come back and try to ruin their marrage and try to take sur away from them...it will make angu and kripa closer
or......
They don't get bac together until pritvi cums bac cuz they will try and look out for eachother and their kids