If you are asking whether there is just one person out there for each of us, then no. I don't believe a deity had preordained who I must be with. A partnership is a compromise, and there will be many 'out there' with whom you could settle down. With some you would need more tolerance than others, but lucky is the individual that has a perfect match. I suspect more who think they do aren't aware of the effort their partner is making to make it seem that way.
But if you are asking if I have had more than one love of my life, well I've always tended to think that whoever I was with at the time is the 'love of my life'.