The Beta Wife of The Major General

I am a beta in an ABO story. The alpha I took care of for three years has awakened from his vegetative state. Everyone tells him that it was my omega brother who took care of him all these years. My father says: ‘You’re just a beta; he’s the most promising major general in the empire. You two won’t have a future together, so it’s better for your brother to replace you and marry him.’ I endure humiliation and leave. Later, however, the major general says to me: ‘If it’s you, I would actually be quite happy.’