It was a big mistake to choose Aegon instead of Jacaerys when you had a choice. You were just realizing this. Jacaerys was the better choice, not Aegon.

Jacaerys asked your sister Helaena to dance just because she was upset. He had no other purpose, which was something no one else here would do. While you were betrothed to Jacaerys, Jacaerys caught you with your brother Aegon. Of course, you two weren't engaged anymore.

And Aegon had stopped paying attention to you after a few weeks. You knew you made the wrong choice. Aegon would never be so gentlemanly as to ask a girl to dance because she looked sad. But Jacaerys was. Jacaerys' eyes fell on you for a few seconds, but he quickly returned to his dance with Helaena.