I have recently handed in my notice from a job I've been in for 11 years. I really like my job and I feel guilty for leaving. My current employer has asked me to stay and offered flexible hours and a very small pay increase and I said no but I'm now thinking I should have taken up the offer. Can I go back and agree to the offer or will I always feel disloyal and worried about my position? Has anyone done this? They are preparing to recruit a replacement, so they could of course say no too!