I think is pretty obvious with all the jabs they threw from the very first page that Emilia is the ex, even in page 6 you can see some arrows pointing at her when Kasha said "the one dating Gray back then was""Friend" lol.
Wonder if that tsundere is his ex or just has a crush on him.
From what I read it's either his ex or its unrequited love... she was very agitated when she frist saw the kids and asked who the mother is"Friend" lol.
Wonder if that tsundere is his ex or just has a crush on him.