The memory of that faithless person is not so pleasant, but we also thought that they would be close to us.

This couplet captures the bitter taste of disillusionment. The speaker is acknowledging that even the mere thought of the beloved—especially a fickle one—is a source of pain. The deeper sorrow, though, is the realization that they themselves were blinded by false hope. They had foolishly believed that their depth of love would eventually lead the beloved to understand them. It’s a poignant meditation on the pain of misplaced optimism.