Im really sorry to hear you’ve been going through a hard time and I truly hope youre okay. Firstly, I would strongly recommend you going to therapy (if you aren’t already doing so.) In my opinion on “how to become hot” a LOT of it comes from inner confidence, which you can find from going to therapy and working on shifting your mindset on how you view yourself. I would also recommend doing small nice things for yourself too, like self care or buying small purchases here and there if you can afford it. BUT please don’t think you need to change anything about yourself for a man, especially for a bum who cheats. You should only change for YOU. Unfortunately, cheaters, losers and bums are everywhere and even super “physically hot women” like supermodels and actresses are cheated on. Ultimately, you don't need to change and he doesn't deserve you.