I think you have to assume your data has been stolen as it's almost impossible to prove that it hasn't. I have received hacking notification on my other accounts since this one was hacked. Hackers normally target obscure web sites (with less security) so that they can sell the data (primary usernames and passwords) on the dark net. That data is then used to access your other accounts on more important web sites or as input into brute force password crackers.
If you use the same password on here as you do on other web site (like most people do) then immediately change it to something else on another web site. Massive Attack recommends safe in cloud for Android or iOS if you need a password manager to remember your many passwords.
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