his "two loves"? Perhaps there were other indications or hints (left unsaid in this very short poem) that suggested the affair was taking place. Or also quite likely is the possibility that the speaker is allowing his imagination to run wild. This idea would not be contrary to the poet's thematic intentions. Once again, the poet may be attempting to show the negative emotions and the psychological effects of lust on a man. Perhaps the speaker's lust has caused him to lose his reason and imagine the worst. Perhaps the speaker has created this nightmare for himself.
In the couplet, we find that the speaker realizes his own uncertainty. He states that until the Dark Lady drives the Young Man away, he (the speaker) will never know if the affair is taking place or not. And, unfortunately, the reader will never know either. The answer is never given in the sonnet cycle.