Ten miles of peach blossoms, two people and one horse. Thank you. Prosperous to the end of the world What do you mean?

It should be: your ex-girlfriend is feeling that at the moment when the peach blossoms are in full bloom (that is, the season of spring blossoms), you two rode horses (that is, the happy moment of love) and snuggled together sweetly, but when the prosperity was exhausted and the peach blossoms came to an end, they broke up and left for the ends of the earth. It means: in the spring, you fell in love, but flowers blossomed and you broke up.