Consumarci is the reflexive form of the verb consumare, meaning "to consume." In this context, it translates to "to consume ourselves" or "to wear ourselves out."
It's an interesting word because it vividly describes the emotional toll a relationship can take, suggesting a gradual wearing down or exhaustion of the individuals involved. The lyric "fino a consumarci" (until we consumed ourselves) powerfully conveys the idea of a relationship that has depleted the partners.
DESOLÉ is an apology to someone the singer grew up with and then lost. The chorus says it plainly: sorry if I made you shed two tears, we were different, sorry if we had become fragile until we wore each other out.
Rhove's verse lives in the memory of being small. His mother tucking him under the covers, wanting to see her happy through all those summers, the years when there was only truth in the middle of her sentences and she would not have left even if the whole world fell apart. Then money arrives. She lent him more than she owed him, and money is what finally separated them. As children everything seemed easier, before either of them became the person they were pretending to be.
Geolier's verse, in Neapolitan, tells the same story from a little further back. They were kids, she was barely a year younger, and they already knew life would divide them. He promised her that one day he would make it. Her father told her not to be with him. Now he has seen her with the man who became her husband, and he remembers her saying he was only a friend.
The image both verses return to is being under a stage while other people looked down from above. The song is about arriving somewhere you promised you would arrive, and finding that the person you promised it to is no longer standing next to you.