Past relationship hypothesis
I look back on past relationships and think about how I would've reacted if I were faced with the same situation in present time and I probably would've reacted very mean instead of passive the way I actually did.. which might've made me feel regret for my actions instead of feeling indifferent about it the way I do when I look back on it now. I have no regrets for how I ever reacted in past relationships and I feel no regret that said relationship is over.