I'm I overreacting or...

So me and my SO only had sex once this month... I enjoy sex. But when I ask him he is always tired or busy or sometimes when I text him if I can come over he never respond. I do everything he ask. But when I ask he doesn't do it or he is busy. I've been tempted to lay with someone else but I'm not that type. Today I asked him if I can come over at 9 and he told me he is at dinner with his family and I got sad I kinda wanted to cry. I want attention but he doesn't give it. I wanna leave him but idk I feel like he will change so I can't bring myself too.  Ugh I'm tired of it. And to be honest it's not even about the sex it about the fact I we barely hangout unless its benefits him. I feel hopeless. 😢