My Stepson & Fiancée didn’t invite me/only my husband to their wedding.

My husband and I have been married for 25 years. He had a daughter and son and I also had a daughter and son when we married. My previous husband was deceased and he had two ex “baby mommas”. We had a daughter together a year and a half after we were married. My husbands son lived with us because his Mother was an addict and was incarcerated most of his childhood until he turned 17 years old. He went to live with her at that point and also became an addict and had bouts of incarceration. During those troubling times, I helped him with bail, fines, rent, vehicles, food, etc. I was always there for him when no one else was. He is almost 30 and doing much better although he has once again reunited with his biological Mom. He is getting married soon and his fiancée gets along well with her. I have been very happy for all of them, feeling they were finally healed. The invitations have now gone out and only my husband is invited to their big wedding. My husband is furious. I am hurt. My SS told his father that my attitude about his Mom when he was a child, (she was absent, incarcerated, pawning his electronics& toys for drugs when he visited, did drugs with him when he was a teen, etc) but, my negative attitude was mentally abusive and he did not want me there. I asked my husband if all of my love and financial support over the years was mentioned? He said not at all.

My question is, should I convince my husband to attend anyway? I have always tried to do what is best for my family and I want what is best in this very uncomfortable situation. I just can’t wrap my brain around it. It truly makes me regret what I might have done wrong, although, I was there every day, nurturing, providing, supporting and trying my best to be a good wife and Mom.
This is no longer about me but about my husband and his son. He will look to me for what I think is best...it is a very troubling position to be in.