Can I consider her my "greatest love"?

I have an ex. We were on and off for 3 years. She was the only love I knew back then that's why I kept coming back to her. Both of us were heavily guarded; both were scared of being hurt deeply but the love felt genuine, it just didn't feel enough to let my walls down. Maybe because she had done something horrible to me that's why I can't love and trust her fully but I know I wanted her. Eventually, I got tired. tired of being confused; of having to wait again when she leaves or being anxious and scared that she might not come back; of having to start all over again. So, I left. I cut all our connections and moved on with my life. I would be lying if I said I haven't thought of her but I fought every urge to reach out because I want the universe let us meet again when we're ready. It's been four years since I cut ties, I am happy with my life now and I thought I had moved on. But then we had another interaction, she told me she missed me and I was shaken. For some reason, I just want to drop all pretense and run back to her, to set aside everything I have built just so I can have her again. I learned that on the years that passed, she had a lot of relationships. I realized she DID move on. She might have forgotten about me and the love we shared. I'm not mad and I'm not blaming her because she had every right and freedom to meet and date other people. But I'm hurt. Is it valid that I'm hurt? for years, I can never look at other people without thinking of her. and learning about that hurts me and I don't know what to feel. I know it's not her fault.

• wlw