Why I think Mihir did it!

I think we still don't know Mihir's back story. Why he is so indebted to Raman. I think this accident episode will bring that forward. I think Mihir was probably involved with drugs after some tragic incident in his past. That also caused him to blackout and probably even do things which he may not have any memory of. However, with Raman's help he was able to turn his life around. However, the whole Romi and Mihika MMS thing probably triggered something and maybe he initially reacted by going back to drugs etc. He probably blacked out when he had the accident. Although, he may suspect himself, he is not sure ...he has no memory of it. somebody else who helped him ( Ashok) in his blackedout state is covering things up and may eventually get him more in trouble.