Dexter - The Final Episode Discussion

[Gunslingerjh]

I'm still in shock after watching the last ep..
I just don't get it..

Deb told dexter the episode before that there was a real human being inside of him. That she was sure of it. Even Vogel and Harry admitted that Dexter changed so much these last moments. He finally found his true love, Hannah, who understands him the best. Everybody told him that he wasn't the perfect psychopath he once was.

Why didn't he believe all those things and went on to live his life in Argentina? How can he abandon Harrison and Hannah?

What do you guys think about the ending?