The Dark Lady. The ABAB, CDCD, EFEF, GG rule in this poem, I believe, says a lot about this poem. If you look at the last word in every line they tell a story.
Shame - Blame
Lust - Trust
Straight - Bait
Had - Mad
So -Woe
Extreme - Dream
Well- Hell
Shame and blame come after the lust and the lack of trust. The speaker had her and continued to be mad when it didn't work out. Their relationship is an extremely elaborate dream when in reality it comes close to a personal hell for the speaker. There is so many emotional ups and downs and crazy feelings for the dark lady. The speaker never rests in his actions and he doesn't seem to feel better about his decision. He loves how she makes him feel but hates how she doesn't feel the same. He's chasing her and she's only giving in because it pleases her to use him. The alternate tenses say a lot about his alternate feelings.