If you hate your government, and you leave to another country in other words, defect. Are you a traitor?

You're not a traitor if you hate your country and the system it uses. You show your patriotism in that case by actively working to make it better. If it's not working for you, and you leave, that's not being a traitor or defecting - that's just emigration.

Now, if you when you leave, you take the government's secrets and give them to someone else or expose them to the world, or do anything else that actively hurts that government, that would be considered being a traitor. But just leaving to live in another country isn't.