Porn kills love

I keep finding poem on my fiances phone every time I go to use it. He never has a problem with me using it but I am so hurt by how much porn is on there. I finally broke down today and told him I rethinking our engagement because of this whole porn on his phone all the time. I feel fat and ugly compared to his taste in porn. I've started throwing up and dieting and working out sooo much just to shed pounds and be skinnier and prettier for my fiancé. Can anybody help me