Board Thread:Questions and Answers/@comment-25322628-20190608065429/@comment-5995523-20190616215228

It's possible that Mikasa's faith in Eren had been lost. She's now close to Armin and Jean. Eren mentioned only tolerated Mikasa because she was undergoing a lot of grief after her parents were murdered and that he was the closest to her having family. Having her overbearingly needing to be by his side has annoyed him at all times and finally tells her off how he felt all those years. Having now realized that Eren hated her, Mikasa realizes she must go her own way and discards the scarf which she has held on to as a symbol of familiar desires.

It's also possible that the final chapter will be fight between the two of them. Mikasa will end up undergoing a mental breakdown after killing Eren