So recently I was offered a job with a VERY substantial raise.
The problem is I need to resign (give 4 weeks notice) to my current employer. Usually this wouldn't be a problem but my boss has been a great mentor, he's stuck with me when I was very sick, and has taught me a lot. He's always nice to me and considered me a friend instead of an employee.
I need to give my 4 weeks notice in next week, how should I go about doing this. I'm very nervous of what he will do / say.
Edit : just wanted point out I have been at the job for 3 years.
Final Edit: I resigned today (earlier then expected), he took it very well. I was worried about nothing. Thanks for all your responses i really do appreciate everyone of them.