the theory for why eren is such an asshole is either zeke messing with his or the likely reason that all the titan users he's eaten is messing with his head. Because in the series if you eat a titan shifter, you gain their memories and some of their personality traits. An example being that armin keeps staring at and going to annie's crystallized cocoon. Symbolizing him taking on Bertolts obsession with Annie
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http://tinyurl.com/3zfs5vb http://tinyurl.com/br9bdeu
https://imgur.com/6re4mWM https://imgur.com/o0b0x9O