I turned down a job w/Microsoft in the early 90's with great options. Interestingly enough, they kept calling me back - I really got the impression it wasn't that they really wanted me, it was just that they were curious about someone turning down their job offer.

Anyhow, I gnawed on this for some years, calculating what the options would have been worth, but I finally let it go when it go to be around 5m.

Anyhow, cry in your beer a little bit and move on.