my metamask account 1 is leaked to a scammer, is my account 2 safe to use?
No 
create a new Metamask wallet.
thanks for the reply
If your account 2 was made using the same seed phrase, then you should consider it compomised.
Best to create a completely new account with a new 12 word seed phrase just to make sure.
If they got your seed phrase, all wallets created with that seed phrase can be recreated by them and they will have full access. So if you have any more wallets made with that seed phrase and they haven’t cleared them yet, move your money ASAP from them.