it’s the hardest question you can get from someone you currently work with.

• because i didn’t want to get stuck in the same boring job for the rest of my life
• because there are no job propects
• becasue in five years, we will still be working on the same thing, and it won’t have moved on
• because the politics is everywhere and just grinds you down

All of these tend to leave the impression that you are saying, “you’re life sucks, and i’m better than that” which isn’t why i’m leaving, although all those reasons are part of why i’m leaving.