1.) Yes. I think Sarah's my soulmate, for one thing. But see below.
2.) Yes. See above.
3.) Dunno. I mean, I did think that Jane was my soulmate. I think she was, for a while, at least. I'm not 100% sure that I believe in the concept of "the one" in that sense. It's possible that there are several people out there who are my soulmates, but they're good friends rather than people I'd even think of being in some sort of romantic relationship with. If that makes sense..? So I guess, to me, the question seems to be confusing two separate notions. Or maybe I just interpret the term "soulmate" too loosely.