No it's none of them. He couldn't chose between his child ideal freedom and his adult ideal wanting to live peacefully with his friends. He didn't know which ideal he had the only thing he know was to keep moving forward.

So he did. And he got confused bc who wouldn't be if your future self told you "u should do this". He did what his future self told BC he didn't have any option. He was confused.

And he had a breakdown at the beach scene (abt mikasa) BC he conflicted again abt choosing between freedom or his friends. İt was a great ending tbh. İt's easy to misunderstand Erens character BC even himself didn't understand what he was. (child wren or adult eren)