wtf how could i knew that someone can hack my gmail account by spyware or something. i just trusted on google's security

i had wallet on blockchain and all my wallet details was saved in my gmail folder like identifier password and wallet address etc. so to login to my wallet i always used to login to my email first. and also i signup with same email for localbitcoins.

Someone Stolen 180 Coins From My Wallet 1GpUcrJ1Zo6ZJWgw7HQT7nADijY5a3dcCh By Hacking My Email. I Saved All My Wallet Details In My Email Not In PC. Thief Changed My Email Password And Password of All Accounts Which Was Saved In This Email. Even I Can't Access My Localbitcoins Account. My User Name On Localbitcoins Was mzee. I Mailed Them And They Just Asked For My Email And Username But No Other Reply Yet. Can Anyone Help Me?