Are soulmates a mythical idea?

I am 26 years old and I in my heart of hearts I believe that there is a soulmate for anyone. This is a belief I have made by thinking it over and over it again. I have also experienced A LOT of cheating in my life, my parents, my two “loves”, my sister, my aunts and uncles.. I have not seen one healthy relationship in my life that I have desired or wanted to mimic. Should I accept that my manual should include cheating possibilities in it and fall in love, or should I work on my beliefs that there is a souldmate for everyone? Thanks!