I do not believe in soul mates - that there is a being on this earth for you and only you. Love is a matter of circumstance, timing and the feelings that are developed with these. But I do however, believe that sometimes we fall in love and think 'this is it'. This happens only once.
we are not meant to spend our lives with everyone we fall in love with. But when you get that 'this is it' feeling, when you truly feel that - That is the closest thing to 'soulmates' anyone can get.