i really need advice.

It was a short lived relationship. I’ve always liked him on and off, between dating other people but then I’ve always felt something for him at some points. He’s been my best friend for years, how could I not fall in love with someone who’s always been there for me and so perfect?

Eventually, he asked me out at some point. He said he liked me and would like to give this a try. Fast forward a month later, he told me he lost attraction towards me. And a week later he’s now dating my friend. It hurts to admit it, but they are compatible. And what hurts is that they both want a committed serious relationship. I have no idea if it’s a rebound or not, but I have told him I wanted away from all this. However, I still love him. So much. I really did want a happy, functioning relationship with him, and as much as it hurts to say it, a future. I’m so lost and I have no idea what to do. I really want him back, and I’m okay if it’s not instantly. I just hope that sometime in the future we could have something together. I’ve began the NC rule already, to the best of my ability as we have many mutuals and so on. Is there any advice I could have to hopefully have him back someday?