Most Helpful Guy
I hate this word 'clingy' what one considers to be an act of being a 'clinger' another finds to be an act of infatuation! Just find someone else who will appreciate your brand of love. He clearly doesn't, and if he can move on so fast he's not worth it and was clearly not interested in you.
Most Helpful Girl
text him and tell him how you feel, just be honest. Honesty is the best thing that you could do. Tell him that you're sorry for being clingy and that you'll try not to be too 'clingy' in the future?