If you suspect that you have been hacked, it is important to first figure out if it’s just you or if your password manager’s database has been compromised. Reputable password managers should put out some form of public release if they have been hacked. You can figure this out with a simple Google search. If they are not claiming to have been hacked, then it may be that your own data has been compromised some other way. If it turns out your password manager’s database has been hacked, it's up to you whether to continue with that service. Thankfully, all your passwords will be encrypted so hackers won’t be able to see the contents even after they have been stolen.