Husband is not wanting to be intimate

Me (27 F) married my husband (29M ) 6 months ago. We have been together for 5 years. Other than the first week of us together our sex life has very much struggled. He never initialed sex and every time I do he most times decline and I have always been vocal about it. Even in the beginning around a month or two, we had sex once a week but in the past 3 years it has diminished to once a month or sometimes once every two months. He only have sex with me after I fight with him about this. When I try to divorce or breakup with him saying I can’t be in a non sex relationship he says he will fix it but never does other than him having sex right after.
Please help I don’t know what to do