Hi there, I am facing almost the same problem with you. But my case is even worse. The guy cheated me that he was single but actually he is married. I tell myself that I must get over and forget about this trauma. Until I attended to a psychotherapy session, the people there told me that we don’t forget our trauma but we integrate it in our life. As part of it. Previously I always waiting for his reassurance be it my qualification or beauty. I thought that I would only feel happy if he ever praised me or commit in this relationship(I was hide underground by him and I was totally cheated by him).
It is not this way, after all, I accept where I am. I accept my failure for trusting him. I accept who I am and live in my skin. I decided to move forward and live in the moment.I realized that I am able to focus more on the people I love and feel comfy to be around. I am more confident now after leaving the negativity behind. And I learned that people are successful because they are happy. I know that the one who should live in guilt will never be me. Further more, Happiness is a choice. I chose to be happy by feeling gratitude, appreciate people around me, be confident because people with confident are positive and they live a happy live. =)