How do you handle good people leaving your company?

Remain positive about their decision because good and talented people will move on to better opportunities. Stay in touch, especially because good and talented people tend to attract the same crowd. You never know if they will send someone your way.

I update my resume.

As the founder? Create a positive and attractive vision for the business and you will attract more and better candidates.

Find out why they're leaving and fix those issues. That way you can try and prevent further personal losses.