Someone is looking back at a friendship that ended three years ago. The speaker remembers the night they parted, and says the memory still comes back as flashbacks. What returns most is the pact they made, a vow of brotherhood that promised neither would ever leave the other's life.
The speaker's feeling is a mix of hurt and self-mockery. Calling themselves "silly" for believing the bond would last forever sounds like someone trying to talk themselves out of caring. The title, "Who cares," points the same way. It reads like a shrug, but the poem itself shows the opposite: if the speaker truly didn't care, the pact wouldn't still replay in their mind.
The mood is quiet, wistful, and a little bitter. The short lines and plain wording make it feel like a private confession, with the sadness kept close to the surface but never fully admitted.