I can appreciate the soulmate idea as a story, a way to depict strong feelings. With the various versions it also gives clues to how people try to explain their different relationships and connections, such as the range from opposites attracts to cookie looks for mate (swedish expression, supposed to rhyme, meaning one looks for something similar to match). But I think many feel something of the kind at times, though perhaps not to the extent of twin flame, a kind of recognition - "oh, look, there's one of my people!"