La.verdad solo vi la primera temporada y los demás no me dio tiempo xd , aunque leyendo fanfic termino sabiendo lo que pasó , sin haber visto lel anime completo o el manga.
Eren himself regretted it because he can't find a better way to save his loved ones, I think he'll be grateful if there's someone more successful than him, of course not for taking his loved one, but it's life, it's only results that matter hahaha