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.
Yeah, i believe in that too some of as used keylogger for easily connected to the main account of our wallets and this is wrong procedure. This can be prevent if your computer will turn off everytime you don't used so that the connection of IP will not be detect by hackers were mostly the beginning of this 24/7 accounts log on.
or , u can try another option , like use MEW extension on chrome.
for safety u need save private key to your private notepad,or wherever u want.
that better i think , u dont need to worry about u surfing to the right MEW sites or not.