bad memories makes experiences

I’ll never understand the whole deleting pictures and unfriending on social media after a breakup, unless the person was a complete cunt. What’s the point of acting like someone who was such a huge, significant part of your life didn’t exist? And just blocking out an entire chunk of your life? Idk I just saw a twitter post of someone deleting loads of pictures after a breakup and I just don’t get it. Your memories and experiences, good or bad, make you who you are.