Have you ever loved and not be loved back?

I just confessed my love to someone, and now I realize that she doesn’t love me. I’ve loved her for a long time, and I’ve always convinced myself that I don’t, mainly because I was scared of her response.

She has a boyfriend, and she doesn’t love him the way I do her, but she’s still happy with him. She doesn’t love me though, that’s for sure.

I feel really depressed right now, and I could use some cheering up. Have you ever been in a similar situation and everything turned out fine?

How do I move on so I’m not stuck loving her forever? Can I love someone else? How do i go about doing this?