I need a possible confidence boost..

My boyfriend, well ex, and I had been together since January 14, 2017. He left me today after I got home through a text. He was happy when I left his house, but it was probably because we just had sex. I need some help because I feel like crap and like I was a bad girlfriend after everything I done proving I loved him. Now I feel like I possibly can't get anyone because of my looks. My self-esteem has been really low lately and nothing has helped.