We're sorry to hear that things didn't work out between you and this guy. Crushes are hard, especially when they don't feel the same way about you as you do about them. We're glad that you are being respectful of his current relationship by not trying to complicate things between all three of you. This shows a lot of maturity.
You mentioned that other guys have asked you out but you have turned them down and we think that's okay. Eventually (when you are ready) you will meet a guy that you won't want to turn down and will then move on from your current crush. Until then, keep yourself as busy as possible by doing things you enjoy. Spend time with friends and keep meeting new people. Remind yourself that if things are meant to be they will find a way to happen. Don't force anything and don't do anything that you aren't ready for.
Stephanie, Crisis Counselor