How does he hacked your mew? Give us complete details so that we can be aware of that scammer.
Your right can you OP give us information how it happen to you?
Also here is a friendly advice
1. is if your giving any address make a new one that is empty
2. If any chances your wallet that requires an email make sure that you make an email address that is different like
for example:
dog10love@yahoo.com is you account which you use to create your social media account and other important stuffs that can give different information.
cat011lover@yahoo.com is the account you should use for cryptocurrency related and electronic wallet purposes
3. If this scammer talk to you about high value return that is the dream come true in one click, stop and think.
4. Ask a background of him on what he offers you and if you feel there is something stop. But if you cant recognize or tell invest a small amount.