I'm not going to my mom's second wedding
Why won't you attend her wedding?
I don't give a shit about her getting married again.
I think you should attend the wedding. Weddings are a big life event, and your mother would feel good if you were there to support her.
I went to the first one, isn't that enough?
Attending both of them is the best option. Even if you don't like weddings, family members are supposed to support each other through thick and thin.