Not invited to stepson's wedding

by sam
(Houston Tx)

My stepson is getting married by the justice of the peace and after that there will be a luncheon. I'm not invited and didn't expected to be since my husband left his mother for me 10 years ago.

She (mom) has a partner now who lives with her. My question is should my husband go to the luncheon also or should he stay away. Is he giving me my place? I feel as if he, my husband is humiliating me by going to the luncheon. People will see that he is there having fun and celebrating his son's wedding and I'm not invited. Should I just ignore it all? My husban is all excited about going and is not thinking that it will look bad that his wife is not invited.

Am I wrong?

Thank you so much for your advice.