Jealous of an ex

I just saw a pic of my bf ex &she is so pretty ! She has a nice body which BTW I do not have . she just so much prettier than me . he told me that if I knew her I wouldn't think she was pretty cause she gots a fucked up personality and she is stuck up . IDC if she's stuck up , she's still prettier than me ! Idk I feel like with me he downgraded . seeing her made me feel like shit .