@Ashok Sir: Thanks for the reply.
The reasons i can think of in my friends case is
-> He might wanna get married, if case is still on, it might not let him settle in his life.
-> He wanna go for higher studies some where else, for which case is a big hinderance.
-> He wants to move on with his future, and his job involves traveling to other countries.
-> On top of this, extending cases will have negative impact on complainant as well since that person is also of same age and would want to get married.
The reasons might sound silly, but, i guess these are the reasons.
Yes, quashing a FIR is very very difficult, because Honourable judge might not be able to conclude only based on FIR in most of the cases, since many people fake lot of things in FIR.