Now why in the world did Mikasa reject Eren? This could not make sense right? She was so devoted to him, but after she found out he was becoming a monster, she couldn’t see herself standing with him anymore.

But there was you, someone she always was so intrigued with. She knew Eren was a lost cause, but you were not. She would pursue you, and she didn’t care how long it would take.

You would be her host, and she was happy with that.