Most likely what happened was those rumors got the best of the whole situation..
Say.. did you confess yourself or did you ask a friend to do so on your behalf?
Whatever way it may have happened, I'd say the best thing you can do right now is try to fix what's happened. And I'm not going to tell you to leave everything as it is by letting people talk freely about it as they please. You may have not face it earlier, but if you want the situation to calm down and slowly remain just an issue between you and her, you should face it right now. It will be scary, yet not doing this might just worsen things all over again.
Moving on is not the right solution yet. You haven't done something you should be ashamed of. Your feelings haven't been properly "answered" because of the way things have gone so far.
So.. If I were you, I'd approach her on my own (with noone accompanying you)when she's not necessarily alone but with a few people or a couple of friends and I'd try to talk to her. Sincerely. Tell her that you didn't want your feelings for her to turn into a mess. That you couldn't help avoiding rumors spreading when you just tried to approach her and tell her about it. That you're sorry and that if the best you can do for her right now is move on, you'll try your best to do so.
And with that.. you might be really be able to move on peacefully, like someone who just tried to confess his feelings to somebody who he loved and didn't mean any harm to.
But don't give up until you've heard a proper answer.. Just.. give it your all, ok? You really can do it.
It certainly has been a while.. Hope you're ok as well and talk to you soon some day for a while <333
Not a psychiatrist but a psychologist maybe. I did for a while.. the truth is I'm really into psychology itself, and just end up reading and watching all sort of books, manga, films and series drama or psychology-related.