Dear David Russ:
I am not a believer in soulmates, not at all. I don’t believe in predestination, which is what the belief in soulmates is about. Someone, some entity decided who should “live happily ever after” with whom, maybe based on a “past life” information (reincarnation, related belief). Your concern is very valid and she validated it: if she meets a man and get that…feeling that he is her predestined soulmate, she will indeed leave you.
I would agree with your buddhist friend on accepting her and her beliefs, but would elaborate on it: do accept that she will leave you when she gets that … feeling for another man. Can you do that? Truly accept and have peace with what she told you she will do: leave you when she gets a feeling for another man? Can it be okay with you to be with her until then and then see her go?
anita