Isn't 3 Times A Week Enough?

I'm 50 and my husband is 54. I'm experiencing perimenopause and he's struggling with the changes. My sex drive is zero. I used to have a healthy sex drive. That's over. I'm ok with being an older lady and the hormones just aren't going to deliver the sex he wants. He mentions his "needs" quite often and to keep him happy, I have sex with him twice a week, three time on a good week. I'm still getting my period so one week of the month I'm out of commission. When I decline sex, he's a total jerk. I'll make him breakfast before he leaves for work and it's just one passive aggressive statement after another. I don't take the bait when this happens or we'll get in a fight. When he leaves, I feel stressed out and like I'm failing my husband and my marriage. It's been four months of this tension though this has been going on for almost a year. I'm looking into couples therapy. Any kind words of encouragement would be appreciated. I adore him and want him to be happy. He's my best friend.