I want to divorce my husband over his previous sperm donation.
Why do you dislike your husband's past sperm donation?
I don't want new children with him not knowing of his past.
This seems like too small of a deal for you to get divorced. Your husband was just helping out people who can't have children of their own and it doesn't affect your life.
I don't like the idea of bringing kids over his past, he should have told me.
I think you should try to talk with him first instead of going straight to divorce.