The speaker is riding the last train home, and the ride pulls up memories of a past relationship: long, sleepless nights spent watching the sunset from someone else's couch. Those small, quiet moments clearly meant a lot. Now the speaker keeps phoning that person, even without knowing why, and each call gets declined.
The feeling here is a mix of longing and embarrassment. The speaker can't let go, but also seems aware of how hopeless it is. The last two lines make that plain: it is "just so stupid" to have believed the other person would ever be theirs. The word "ever" suggests the love may never have been returned in the first place.
The language is simple and the lines are short, which makes the poem feel like a thought spoken aloud late at night. The mood is lonely, tired, and quietly sad, with the speaker turning their hurt into self-blame.