Oh wow Abe just revealed a tiny bit of his past!! And honestly, now that I have been thinking about it - I've come up with a theory. In the previous couple of chapter, when Andromeda was talking to Nebiru, she mentioned something about a lover - I'm convinced that Fay was Andromeda and Abe WAS HER LOVER. The way he mentioned about the girl long ago sounded nostalgic but he also felt a bit uncomfortable telling it, especially to Fay. There's many signs of Abe keeping a secret from Fay but he's beginning to tell it, bit by bit. I'm hoping it's true oh my goodness but that's my theory anyway ;p

I don't know what you have in store but this is definitely interesting. Keep it up :)