There have always been elves who did not wed, who had an especially close companion who was enough.

[ the next one is far easier: ] No. Of the mortals who loved elves, there were only four. Beren and Lúthien, Imrazôr and Mithrellas, Tuor and Idril, and Aegnor and Andreth. All but the last were mortal men and elven women.