Why the mc is being such a douche about the mc past? Wasn't he your so called friend? Why ...

Why the mc is being such a douche about the mc past? Wasn't he your so called friend? Why would you private him from his memories if he's clearly telling you that he can't remember? I get that he may be sad because his childhood friend doesn't remember, I would be sad too, but c'mon! It's not his fault that he can't remember!
I would be really sad and angry if I lost my memories and someone that knows about my past decides that he's not gonna tell me things that I obviously have the right to know about me.
I hope this changes soon.