The National Party leader says there were differing accounts of allegations against Sam Uffindell.
The Tauranga MP has returned to the party's caucus after a King's Counsel's investigation didn't substantiate bullying claims made against him.
A former flatmate of Mr Uffindell says she provided a written statement to the KC, Maria Dew.
The woman stands firmly by her account of what happened at the flat, and is deeply unhappy Mr Uffindell's word was taken over hers.
University of Auckland lecturer in New Zealand politics and public policy Dr Lara Greaves spoke to Māni Dunlop.
