I Am Friends With My Ex

I'm friends with my ex. We dated when we were teens and again in our mid 20s. We recently started talking again about two months ago and we text and talk everyday. She says we are soulmates even if we are only meant to be friends but I haven't stopped loving her since we were young. No matter how many other women I meet, date and sleep with I can't get over her. I want the best for her even if it's not me but it's hard.