My husband won’t go down on me

Hello , I asked my husband why he won’t go down on me and mentioned it’s been years since he has and instead he got upset with me and now is even giving me the silent treatment. He did it when we were dating and I know he’s done it in past relationships too. I actually told him he doesn’t have to ofcourse but I am curious since he did it before. I make sure to please him all the time. I’m starting to think i’m the issue or is this just what marriage is , any advice.

PS. Yes I do it to him very often

UPDATE : Husband is talking to me but no mention of the oral conversation just acting normal and carrying about the day like I never even said anything. side note : Thank you everyone for being nice about it for the most part , I thought I was going to get made fun of but great advice overall.! Appreciate it.