In that particular example, regret would be justified, as it would be a remainder not to listen to the bad advisor.

However, if, at some point, both advisors decided to leave and never come back, and you started thinking about how one of them always gave you wrong advice, and regretting listening to him, then that regret is pointless.

I also don’t believe in regret. For me, I’ve always listened to my gut and I’ve always made the right choice. I believe in the power of listening to your conscience. Since I’m so attuned to my conscience, if I make a mistake I catch it and take the next chance to rectify it before life moves on. I never allowed myself to feel regret even if it meant pushing myself way out of my comfort zone or disregarding the advice of someone who has a lot of influence on me. It helps that I’m highly disagreeable (in terms of the Big 5 personality traits).