Sometimes it's a "catch 22" when someone ends a relationship. It's almost a cliché to say; "It's not you, it's me." However it's the truth! The one who wants out is the one who is unhappy.
Nevertheless there are some people who insist on getting "closure" they demand to be told why you want to breakup with them and by that they're essentially asking you to list things you dislike about them. If you don't then they believe you're holding something back.
I've often said that asking for "closure" oftentimes is the equivalent of asking someone to kick you in the head as they walk out the door.
"There is nothing your ex can say to you that will make you feel better about having your heart broken!"
Besides the very traits (they) dislike about you will be the same one's that causes another person to fall madly in love with you!
I have no idea of whether or not this young lady (insisted) on being told the "real reasons" why this guy wanted out of the relationship or if he simply wanted to crush her. It's also possible that he has gone through this before where girls have tried to ignore the breakup and continued to try to keep the relationship going. This can lead to a person being very harsh in order to drive the message home the next time they end a relationship.
The bottom line is it does this girl no good to dwell on "how" the breakup took place. The end result is the same. They're done with the relationship. Naturally she'll grieve among her friends but eventually she has to get back to taking care of herself mentally and enjoying life again. I know it's not much help hearing this but it's true, everyone goes through breakups. It's not the end of the world.