I think the universe fights for two souls to be together but unfortunately, the human experience is flawed. We aren't given instruction manuals on how to live life or how to love people or the sure path to successful relationships or careers or raising children or asking for help, or any of the things that can only be learned with time and many,many mistakes made inbetween the good parts.
Love, like life, is an imperfect experience we are constantly experimenting with.