I always think tt is a bad idea of people asking abt others relationship in the past with someone. Its not good for the mind n emotion. Any relationships that end is nvr a good one. Its not really a good idea asking someone abt their past relationship[s]. But we do ask because out of curiosity. Even I can't deny that. Cuz I do that sometimes as well for certain reasons. But what you are actually doin may also hurt their feelings cuz when you ask them abt what actually happened in the past, it also shows that they are reflecting back and wonder what actually went wrong. I'm sure you have come across ppl that says smth like, "Uh pls dont ask anymore", or "I don't want to talk abt it", or "I still hate him/her" etc. It could be anything. Those sentences signify feelings. It shows that the person still feel the animosity over the last r/s. Which is why sometimes its very risky asking one abt the past. But then again there's no wrong or right for asking. Statistic shows that more than often people do actually tried not to think abt the past cuz it may still hurt them one way or another. But it is also depending on the individual itself whether they have overcome the past. Our heart is very fragile n sensitive. Fragile as in a way that once hurt it will take a long time to recover. And sensitive in a way that even words can deteriorated ur heart. Even a slightest words such as "I love you" can make ur heart melt whereas things like iceberg needs the heat from the sun to melt which normally process very slowly. Something which many of us didnt think of how fragile the heart can be.