Am i doing the right thing?

First, I'd like to clarify that I'm a girl who doesn't have too many friends and is very shy. I had this male best friend for 6 years, and I really loved him. The first time I confessed was when it was just a strong crush a few months after we'd met. Time passed and I thought I'd moved on. I dated people.
There were times during our friendship that I thought he might like me, but those thoughts were dashed when he talked to me about the girls he was crazy about. He's not the kind of guy to beat around the bush for a thing like that either. Eventually, I started feeling like he did seriously. I let these thoughts fester for a few months and realized I loved him. I was so certain that I ended up confessing to him, only to be crushed.
We kept a bit of distance for a little while, but were fine once we got over it. However, now that he has a girlfriend I've been keeping a very large distance. I don't want to make either of them uncomfortable and I'm too shy to talk to him right now. I see them both every day. Am I doing the right thing, or have I pointlessly lost my best friend?
TLDR; I'm keeping my distance from my best friend because he now has a girlfriend, I've been slowly getting over him, and don't want to bother them.