Nah. There's plenty of fish in the sea. You're not "destined" to be with only one person or something. But whoever you do end up with, you better treat them as if they were a soulmate.
Not particularly? I believe there's people that you're very compatible with, though, and it isn't always necessarily romantic? I guess in that sense I do believe in the concept, somewhat. However, I don't necessarily believe there's a supernatural aspect to it. I think relationships take a lot of effort and communication, regardless of how compatible you are.