Why does Jeff participate in Abnesti’s project at Spiderhead? Has he chosen to…

Why does Jeff participate in Abnesti’s project at Spiderhead? Has he chosen to participate?
Thanks to Verbaluce, Jeff is able to wax poetic about loving Heather. He refers to his deepest longing fulfilled. Does Jeff love Heather? If not, how is genuine love different from what Jeff experiences? Abnesti says, “Say someone can’t love? Now he or she can.” Does the project at Spiderhead support Abnesti’s claim?
Why does Abnesti tell Jeff to make a decision whether Rachel or Heather should get Darkenfloxx? What is Jeff’s decision? Does he make it freely? Explain.
What was Jeff’s fateful night? In what sense was it “fateful”?
How does Jeff “doink with [Abnesti’s] experimental design integrity”?
Why does Jeff feel “a little jerked around”?
Does Jeff freely participate in the Confirmation Trial? The test reveals that he no longer feels any romantic love toward Heather. Verlaine says that he’s showing “just pretty much basic human feeling.” What is the difference between feelings that belong to Jeff and those simulated by the study?
Saying “acknowledge” implies permission, but why would it be misleading to call this consent?
Does Jeff choose his fate at the end of the story? Is it completely up to him?