i'm tired of my husband

at this i don't know what i'm doing but my husband just doesn't wanna have sex with me no more, men in this sub u think he cheating? we used to have an amazing relatinship with tons of sex, but now after 8 years married i think he has changed a lot, he just feels distant and the worst part is I keep getting unsatisfied in sex, he's always too tired. like i do am a little freaky but at this point i just need some dick, i really need it and he somehow just doesn't care, i'm a mother of a 3 year old so that makes thing worse, am i a bad woman for starting to look for affairs to feel plenty again? Idk but i really need a true man to make me feel desirable and sexy again (cause i know i am but i feel like my husband can't see it no more), i want nothing serious, just something casual to keep me fresh, i need sex