Oh my... that is a HORRIBLE thing for your ex to have said!!!! Omgosh..... WOW. That is so very hurtful and harmful to someone. NO wonder you're having issues with your current relationship and with not feeling good enough. Please do not embrace what your ex said to you. Love yourself..... love all that you are because I am sure you are a very lovely person with SO much to offer someone.

Do you see a therapist? I think that would really help you to work out these negative thoughts you are having.