Porphyria's Lover

In "Porphyria's Lover," we overhear the title character speaking of how he murdered his beloved Porphyria. You take it from here, but be sure to try to explain the last line.

The poem starts off almost sweet. This woman, Porphyria, loves the man, the speaker. He watches her as she enters the place, locking up behind her, and then sheds her clothing that had grown wet from the storm outdoors. “Withdrew the dripping cloak and shawl,//And laid her soiled gloves by, untied//Her hat and let her damp hair fall” She even released her hair, which from what I know of this time period these two must be intimate considering most ladies would never do such a thing in male company. He does not answer her when she calls, but she seemed unphased and just places his arm about her waist. The speaker says she’s too weak to do the things she wishes or he expects her to want. “Too weak, for all her heart’s endeavor” With what she is doing to him, however, it would seem she expects him to be weak as well. She loved him, “worshipped” him even. He wanted her to be his though, “That moment she was mine, mine, fair,//Perfectly pure and good” So he killed her. “In one long yellow string I wound//Three times her little throat around,//And strangled her” He didn’t regret it, not at all and swears she didn’t feel it, “No pain felt she;//I am quite sure she felt no pain.” Then he shifted her body to sit with him. I feel he might be an invalid or nearing death himself perhaps. She obviously trusted and loved this man, and he loved her as well, but he loved her so much he wanted to keep her with him forever. But there has come no punishment, no angel in the night to deliver either him nor her from each other. He is happy about this. “And all night long we have not stirred,//And yet god has not said a word.”