This is not a 'rebound'. This is plain and simple calculation and manipulation. She kept you on the side until she was sure of the other dude's intentions and you were gullible enough to let her take advantage of you and keep your hopes up. She might have thought you were the right one at first, but has changed her mind and picked someone else - although being dishonest to you about it. She too will have to learn how to mature and stop treating men as tools to her benefit - because this is not a game. But, be glad that SHE is NOT your problem now and you should forget her, don't contact her anymore, and start your healing process.
You learned a lesson here dear, and I hope that it helps you pick the right girl in the future. If you have a feeling of being used and have lost trust in your partner - remember how this one went about it and be strong enough not to be used as a temporary harbor until the 'right ship' comes in from now on..
Don't let this bring you down or make you lose confidence in yourself because
I promise you that you are not the first one this has happened to and you will not be the last. That's just cold hard facts of live.
Stay with us and we will help you heal and cope with it and regain your confidence and even get stronger so that you will not make the same mistake again.
Read the first four stickies in the Relationship section - they really help and show you that you are not alone...
So, stay with us and vent on here any time you feel you need to.
It no longer matters what SHE thinks... it's your turn to think about you and your happiness, so the sooner she's history, the better.