An interesting poem. As the other person said, it's relatable, as it's sadness is something which I think the majority of us have felt at some point or another.

Other than that, fairly well written (i.e. not quite on the brilliant side of good, but good and readable). I particularly like how you don't directly refer to what it is your on about until the lastline, building it up and then going for it. I also really like the lines: 'the thought of it is powerful/but knowing it is even more.' Not quite sure why though, sorry.

Relatable. I'm not very good with feedback, but this was well written in my opinion.