I have no idea if there is a 'soulmate' for everyone. Between my 1st and 2nd marriages (10 years), I had pretty much given up on the idea of a 'life partner'. For that 10 years I was a serial monogamist with 5 women. All were enjoyable - but ran their course.
It wasn't until I stopped looking, that I found my 'soulmate'. And in many ways we complement and complete each other.
Do I think there is more than 1 person in the world who could fill that role? At one time I would have said yes - but there is no one who could come near the closeness and intimacy that I now have - so as with many things, my views have changed. If I were a politician I would surely be labeled a 'flip-flopper'!
The best of luck to you as you explore your future. Don't forget to enjoy the journey. Try not to expect too much from relationships - the pressure to perform - or deliver can kill relationships. Let them evolve - they will either thrive or die - but you can still have a lot of enjoyment from the experiences.