til that the "Cara Mia Addio" in Portal 2 (better known as the "Turret Opera"), when translated, is a full on love song in which Glados refers to Chell as "beautiful" and "dear" throughout, with Ellen Mclain saying in an interview afterwards that the song is meant to essentially be taken as "I'm going to miss you, goodbye, my beloved"
I like to think then that Cara Mia Addio was a song created by Glados in a foreign language that Chell wouldn't understand so that way she could tell her how much she meant/means to her without being too direct because she's scared of attachment
In conclusion, happy pride month to whatever the fuck they had going on