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You could feel what his mother feel that time, she could not divorce with his husband without the husband consent, and their marriage was acknowledge by the Royal Rule and the Clan rule. Full of anger his mother leave the house and be a free woman outside and never come back again although she still hold the title of the legal wife of his father. Don't know how much his mother change lover after that. She even hate her own son, because her son is the reason why they married in the first place!.
If she was not pregnant in her one night stand with that scumbag in their High School reunion, there is no way the two will marriage. And there is no way she will marriage a man who have a first love and even already sleep with that woman!.