Husband won’t sleep with me

For the past 6 months I haven’t had any sex and hardly any physical contact with my husband. We’ve been together about 4 years and married just under a year. We’re both young 25 & 26, I try to initiate sex but he always turns me down every single time so a few months ago I gave up and waited to see if things would change. Nope, still the same. I don’t know what the problem is or why he doesn’t want to have sex. I try to talk with him about it but he just ignores me. I’m getting depressed. Also I’m pretty sure he’s not cheating. Idk what other reasons would stop him from wanting to have sex? Idk what to do please help me ladies.