The Titans, the war, the rumbling.. after all he went through he was scarred, both mentally and physically. He couldn't sleep without nightmares, he saw things and he had trouble walking. Even though he was still so young, he was so.. broken. It broke your heart to see him after it all. After going through so much only to be left by the world. It broke your heart even more when you visited him in his temporary housing to hear what he said

I'm so weak.. if I was stronger Eren would have lived