THE FUTURE WAS NEVER FIXED
Theory, everything that eren told armin about the future not being able to be changed was just hes delusion, because he wanted that exact same future and made up a point that minimized the guilt of his actions. He was just a monster who went completely mad at 19, but heres the paradox, this all resulted in the same things eren saw after kissing historia so technically the future still remains unchangeable.
i meant that the future is fixed, but it is fixed because not that the choices will occur whatever eren does, but because he will always choose the same things to do since he is a heartless bastard. I mean the future IS changeable, but this specific part of the future is fixed because erens choices are fixed. Eren had free will, but because of who he fundamentally was, he would always freely make the same choices, and therefore this future becomes fixed.
Imo eren IS heartless, because hes just a teen who doesnt know nothing, and thats why he chooses HIS freedom. you see, as he said to armin, the friends sacrifice was also just a coping mechanism. Hes coping mechanism is just like walter whites, and i cant imagine how unhinged eren was at that time, like i will straight up crap my pants if asked to become his roommate.
Anyways, but in the midst of all that madness, he still confessed his love, and that part was actually true(gotta confirm this). But wait, he wasnt just unhinged when he turned 19 he was shaped into a monster from the very start. Even though he claims he was just "born this way," that's just a crazy delusion he tells Armin to dodge the blame. The brutal reality is that living caged inside the walls, dealing with constant trauma, and witnessing absolute violence are the exact things that made him someone who wanted FREEDOM. Claiming he was born a monster is just his final coping mechanism to avoid facing what his environment actually turned him into. Man, hes case is something else, because as i said, eren was made a narcissist by everything around him. He wasnt BORN a monster, claiming that was just his final coping mechanism.
I wished ereh kept that beard, it just suits him!