In love with best friend

I think I’m in love with my best friend but I’ve been in denial for a long time. We have such a deep and soulful connection, he is my favorite person and always has been. We’ve built such a solid friendship, I never wanted to jeopardize it. This past summer it seemed like he was feeling me out/ throwing out signals that he had feelings/ was interested in something more than friendship, but I was scared and unsure and I didn’t really reciprocate, so I think he took that as a “no”. He is now dating someone else but I can’t help but feel like I made a mistake. I feel like we belong together but now I don’t know what to do. It seems like we can’t get the timing right. I’ve dated a lot of people but nothing feels even close to the way I feel with him. I know what we have is rare, but I also want him to be happy in this new relationship and respect that boundary. Any advice welcome.