You're wrong neversung, they were never a couple, this is a story about unrequited love, here what Lilac said in Tapastic:
"In this one-shot short story, it represents unrequired love and understanding of combination between both friendship and romance. I want to express the reality that sometimes we can't really control how our feeling develop to someone, and love depends on two people decision and understanding. The feeling that pass the thin line between friendship and lover, it's very complicated to overcome. If we learn to accept who we are and truly love and understand the person that we care about, we will learn that the true form of love is unconditional. As long as the person is happy, it's enough."
"The two girls are good friends, I can tell (old friends?).
Maybe they have been more than friends in the past. Lovers? Maybe yes, maybe not. But today their relationship is over. They managed to stay close friends"
"Also thank you very much Eve for sharing your aspects and opinions, you have understood everything perfectly. ^^="
It's not so simple as no they were never lovers T-sama.