I know this might not bring much comfort, but there are positive and negative in every action, try see the positive and then will you feel better.
Use this incident as a learning experience:
Start making it a custom to have a strong password policy (Most people are sometimes too sloppy with this).
And all the other good safety stuff:
Use different password for different sites.
Use 2-3 way authentication (when available)
Use special email account for you bitcoin business.
This might save you much more money in the future than you have lost today, if you learn your self to be "paranoid" on the internet.
Again, sorry for your loss, I hope the best for you and I am sure you will recover.
Luckily he didn't steal my Litecoins, probably because they weren't worth much at that time. Now its worth like 10 times more. I've got it set up with 2-way authentication with Google authenticator.