I suppose it's likely that she was manipulated into loving him but IMO I think it's just as likely he manipulated her into terror. For example, something such as mentioning the address and physical description of a loved one that he would only know if he had outside eyes on them, or some form of blackmail collateral that he'd gleaned.
CW doesn't appear to have made this plan spontaneously but I think it's possible the decision to act that day may have been spontaneous. He knew that jail, had planned to escape it before by taking a hostage, and had still managed to get himself transferred back to it by admitting to a cold case and then pleading insanity to buy himself time.
I imagine he would also have planned out in detail which hostage he'd take, what schedule they had, what size body, what made them tick, etc etc. Maybe MOO when he heard that his intended target had just put in her retirement papers he had to act quickly before he lost his chance to use whatever information he had acquired that could convince her all she had to do was let him go and everything would be ok.
And IF he DID commit the murder-for-hire, I imagine that would have made whoever hired him very nervous. Maybe nervous enough to help him escape MOO.
Maybe I'm just trying to give VW the benefit of the doubt, but if he's a psychopath then he could use his words in other ways than just love letters to convince her to free him. All MOO