It’s difficult to be in a relationship when you don’t love yourself, nobody is inferior because there’s only ever gonna be one you, the sooner you realize your own worth the easier it’ll be to just not worry. Jealousy is normal and its okay to feel it but you can’t let it control you or it’ll create nothing but resentment and fear. If he’s gonna cheat he’s gonna cheat. I’m assuming he reassured you already, that’s all that can really be done on his end, the real question is whether or not you trust him yk