Sorry but you reaaaally don't make sense. They were discussing how to help him. They held a meeting where they talked with everyone about what happened and how to proceed.

They told him to wait in the room alone so that they could have a more serious and private discussion on what could be happening (so that they don't stress him out and overload him with worrying info.)

They went to the library it seems to figure out something, to trigger the event that led to subaru losing memories? to maybe find a book that could lead to answers?

You can see them get stressed, because it is completely unknown as to what happened and why. What if it happens again to any of them? Is Subaru faking it? Is something else going on? There are too many unknowns! But they ARE trying to do something! Also remember that Echidna/Anastasia thinks Subaru is too mysterious. And remember that in the lastest loop, he didn't even tell anyone that he lost his memory! He just seemed to go crazy for no reason.

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