I (22M) am in love with one of my best friends (23F), but she’s with someone else

A little back story, we met online a year and a half ago. We’ve been really close since then, and were kinda together for a couple months, but she said she wanted to be with someone closer (we live about 2500 km from each other). Now she’s with someone in what is a long distance relationship

Since I first met this girl I’ve had feelings for her. She’s really sweet, kind, beautiful, and my favourite person to talk to. A month-two months after we met, we both admitted we had feelings for each other but never said we were dating, but we were definitely more than friends. We constantly said I love you to each other and had intimate convos over text/phone. The long distance definitely made it tough for us, but I was willing to do whatever I could to make it work. Unfortunately after a couple months she said she couldn’t handle the distance anymore but we still remained good friends. I never lost feelings for her, and still love her.

She then started seeing someone closer to her, although it didn’t last very long, and she told me that she wished we lived closer together so we could be a couple (we both knew that wasn’t realistic at the time though). After that we never really got back into talking like a couple, and I regret it because now she’s together with a guy that lives almost as far apart as I am to her, so she’s clearly okay with distance now. When she told me I told her I was really happy for her (she is still one of my best friends and she’s gone through lots of tough times so I want her to be happy), but a big part of me regrets not opening up to her about the feelings I still have for her. I don’t want to do it now because she’s with another guy, but she also is my dream girl, and everything I’ve ever wanted in a girl. I don’t know what to do because I don’t want to ruin our friendship