But he knew she found him arrogant and self-centred, the 33-year-old former economics tutor said during his second day of evidence at his murder trial.
Weatherston stabbed Miss Elliott to death in her Ravensbourne home on January 9, 2008, inflicting 216 separate wounds with a knife and scissors.
He denies murdering her but admits her manslaughter, the defence arguing his anxiety disorders meant he was unable to deal with the emotional pain of the volatile relationship and he lost control when she attacked him with a pair of scissors.
The Crown says Weatherston committed murder, that he arrived at Miss Elliott's home with the knife in his bag and attacked her with the knife and a pair of scissors in a persistent, determined and focused way, disfiguring areas of her physical attraction and beauty.
Weatherston spent yesterday detailing his anxiety issues and his troubled relationship with Miss Elliott through the latter part of 2007.
But today, he is expected to tell the 11 jurors what he says happened the day he stabbed 22-year-old Miss Elliott to death.
Yesterday, he related how Miss Elliott had come to his office seeking help to prepare for interviews in Wellington.
He gave her advice and they got to know each other in the weeks that followed.
She then invited him to her home to watch a DVD and he slept the night in her bed, although they did not have sex.
When she visited him at his flat the next day they showered together but did not have sex because they did not have protection.
They later went to a 21st party together, and to several bars with a group of people.
Weatherston described himself as fragile and self-indulgent, a hard person to be in relationship with and he agreed with the assessment of a former girlfriend, who said she felt she was "walking on eggshells" while living with him.
That was what he felt he was doing in the latter stages of his relationship with Miss Elliott, Weatherston told the jury.
