He won’t ever go down on me

I give my husband head all the time. I actually enjoy it. And he won’t go down on me. I think he’s done it twice? He makes up all these excuses, and then I shower and make it known I’m clean and ready to play and he still finds excuses. I then tell myself I won’t give him head since he won’t give it to me. But then I find myself wanting to again.... ugh so frustrating.