Threatened Divorce Over Sister’s Wedding

Am I the asshole for telling my husband I was going to divorce him for going to his sisters wedding?

So this is happening in real time and I don’t know if my emotions are super high rn or

I’m completely in the right. My sister in law is getting married and I been helping

her plan her wedding, from the DJ to the makeup artist to hair etc, she asked me to

be in the wedding party, I agreed to that, my husband agreed to have me read

a prayer at the church even though I’m not very religious and to sponsor the wedding,

I was never asked for that. Comes to today her first dress fitting, I’m there with my

mother in law my sisters in law and her future in laws, everyone was looking at bridesmaid dresses