i am getting worried more and more because there are a lot of people being hacked the wallet 
Don't use metamask, and do not use MEW if you do not have a hardware wallet or a safe encrypted wallet.
I do not understand why there are a lot of people still doing the same, is like if you like to get hacked.
Sorry, but there is no going back in here, just buy a hardware wallet.
well the logic reason about it just , probaly u get keylogger when you surfing on internet.
or phising with fake mew.
a most of people still not aware about how to secure a simple wallet like that.