What happens if you lose control of your private key? How do you ensure the recipient keeps up to date with which keys have been revoked? Isn't it a risk that u

What happens if you lose control of your private key? How do you ensure the recipient keeps up to date with which keys have been revoked? Isn't it a risk that unless you keep changing keys you're at risk of someone getting your private key and having access to every message you've ever received?