I think that Ash wants someone who can fully love them in the way they want to be loved, which includes honest emotional responses (that SAL cannot provide). I think that's what everyone wants really. Again this might just be me projecting but Ash saying that they don't mind SAL being so logical and different from them, is a bit self-deluded because Ash wants to continue the relationship.
I think Ash will drift away eventually once they realise that SAL and they want different things and SAL cannot give Ash what they want. But as I've said this is coloured by my own experiences with relationships. I think I'm reading this as a sci-fi parallel of "I love you but you only see me as a friend" and I've been there like many of us have been. In these cases trying to remain friends is difficult and people tend to drift away. Not always but this has been mostly my experience.
Then again this is just an interpretation. Everyone sees different things and that's the beauty of art, isn't it? :)
I hope you enjoy playing my game and I'd love to see some feedback! It's a rough first effort but I'm proud of it in a weird way. I was a bit hesitant to make a twine but after playing the great twine games in this jam I'm pretty encouraged. :D