Chapter 3 explains what happened to the Teleri who stayed behind in chapter 1.
I was originally skeptic to the whole “in a trance for 100 years” thing (nice try, Professor). Then I realized that it was actually much funnier that way. Can you imagine Thingol being in a trance for 100 years while Melian goes on with her life in the meanwhile? She probably doodled on his face with sharpies. And used him to hold up laundry lines.
(I might have to draw that some day.)
He forgot then utterly all his people and all the purposes of his mind, and following the birds under the shadow of the trees he passed deep into Nan Elmoth and was lost. But he came at last to a glade open to the stars, and there Melian stood; and out of the darkness he looked at her, and the light of Aman was in her face.
She spoke no word; but being filled with love Elwë came to her and took her hand, and straightway a spell was laid on him, so that they stood thus while long years were measured by the wheeling stars above them; and the trees of Nan Elmoth grew tall and dark before they spoke any word.
Thus Elwë's folk who sought him found him not, and Olwë took the kingship of the Teleri and departed, as is told hereafter.