Trident101's poem is only three short lines, but it describes a painful, familiar situation: seeing the person you love be loved by someone else. The speaker doesn't shout about it or paint a dramatic scene. Instead, the feeling is stated plainly, almost like a fact, and that calm tone is what makes it sting.
The key word is "slowly." The speaker doesn't say this will break your heart in an instant. It suggests a steady, quiet wearing-down, the kind of hurt that builds each time you have to look on and say nothing. The title, "Everyone's Problem," widens the lens. It hints that the speaker isn't alone and that this kind of jealous heartache is something most people go through at some point.
The mood is bleak and resigned, with a touch of sad honesty. There's no solution offered, just the recognition that some pain can only be endured by watching.