Per Terms of Service, it's not even allowed to give your login details to someone else, so I'd recommend continuing with your own account from now on. I had a similar situation when I was deciding which of my accounts (PS4 or PC) I would set as my cross-save main. On one hand, I had much more history with my PS4 account, but on the other, I had earned many more seals and triumphs on PC. I went with my PS4 account, solely due to history and now I have almost caught up with my PC account's progress. I know it's a big task, but in the end you'll be happy that you made the switch.