Low Sex Drive - Hurting Intimate Relationship

My husband and I have been having trouble with our sexual relationship lately. It’s started about 8 months before our wedding in December 2019 and has been a non stop struggle since. My husband is always up for sex, is ready to at the snap of my fingers, but I feel like the problem is me. I have no drive to have sex, don’t crave it, and sometimes turn it down when he asks. We only have sex about 2-3 times a month now and I can tell it’s frustrating him.

It’s to the point where I’m getting frustrated that he is frustrated, and sometimes it ends in an argument about why we think we’re having issues. We can’t seem to come up with anything logical.

I’ve never been able to get into “scheduled” sex. We tried anyway, but it didn’t help.

Nothing has changed between us or in our lives other than getting married and him gaining a bit of weight baritone to that. I’m open to any all suggestions. I just want us to go back to how happy we were together and how good our intimate relationship was before this all began.