"i'm still friends with all of my exes" is up there with "i got along with everyone in high school" for not saying what you think it does.
you might as well announce that you do not understand and have no tools to navigate emotional traumaβeven secretly believe it's all made up.
it's really not a sign of maturity to have skated through life without having being meaningfully bullied or neglected or abused, never forced to question your own self-worth and behavior.
it's not mature to puzzle over others' pain and decide it's all a histrionic performance.
it's not mature to consider every conflict somebody else's problem that they're inflicting on you because you already know how cool and balanced you are, how your ability to get along with everyone speaks to your fairness and reason, so clearly they must be the unreasonable party.
i always say if you think you were friends with everyone in school that probably actually means you were the bully.
if you really can't understand why a girl might cut off contact with a person they had until that moment trusted with everything... well, you may not enjoy the implications.