The speaker starts with a simple statement: they love the way their partner looks at them. But the poem quickly turns to something less obvious. The speaker knows how they look at the other person when that person isn't paying attention, a gaze full of quiet admiration. That private look is the one they wish could be seen.
The final lines make a small, tender wish. If the speaker could watch the way they themselves are looked at in the moments they miss, they'd love it even more. In other words, the speaker suspects the other person's unguarded look is the most honest one, and they long to witness it.
The mood is warm, shy, and sincere. The language is plain and the lines are short, which suits a feeling that is gentle rather than dramatic. It reads like a quiet confession: love is partly about the moments we can't see, and the speaker wishes they could.