Mike's reaction:

Rachel Berry is dead. The Rachel Berry. How? How could people be so cruel as to drive her toward that? It's just awful. The thing I regret the most is that she is one of the nicest people I have ever met, yet I know almost nothing about her besides the stereotypical Rachel Berry: destined for Broadway, annoying, conceited, ambitious, abrasive, and confident. But she's more than that. I know she is. And now I have no more time to get to know her. She's complimented me on my dancing more than anyone in Glee Club. She got the most hate and was unappreciated more than anyone. She probably felt like she was alone. And it's too late to show her that she wasn't. I'm so sorry, Rachel. I really am.