I Confessed My Feelings To My Best Friend

My(25m) best friend(25F) started a long distance relationship a week ago. This brought out of me jealousy and worry. Now that I was at risk of losing her I decided to confess my feelings for her. We tried a fwb thing years ago but it didn't work thanks to my anxiety so I ended it. If I was mature back then I think it would have worked.
She rejected me. She texted me a few hours after the call saying that now that she realizes what she wants from a relationship, she can only see me and her as friends now and in the future.
I hate that I couldn't give her what she's looking for. That I'm starting to fix my problems now and not before. How everything I wanted to tell her and do was already done by someone else. I was too late.
She Said she wants some time apart to refresh our friendship and that she wants me to be a part of her life.
I'm hurt. There's no other way to say it. Rejection sucks. I'm extremely glad she got to find someone who makes her happy. She's been through a lot and deserves it. I just wish that it were me.
So now I'm stuck with this hole in my chest. I don't know how to make it better. Any thoughts?
TL;DR I told my best friend how I feel about her and was rejected. Stuck with a hole in chest.


Source.