Guild Wars 2

So i got a email about a login attempt with this information
Address: 222.67.30.84
City: Jiangchuanlu
Region: 23
Country: CN

Now this wasn’t me of course because if it was why would i be posting here but anyways does this mean they were just trying to login or actually had my password and just needed email to verify? I went ahead and changed my password but still im kinda suspicious cause to be plain my password is just stupid hard to hack 0% you could ever guess it and it consist of random numbers and letters so the time to brute force it would also be ridiculous. What im suspicious of is how they would have gotten the password if they actually had it and yes my computer is secure though once again to be sure i just ran scans of it with antivirus/antimalware programs.