"Nothing is over until it's over," he said. "I'm an ordinary person and I don't always get everything right and I've never made the pretence that I do.
"The serious allegations here are false and so, for me, it's about whether or not the supporters can forgive me and support me and if not that's fine I accept that."
Mr Craig said members would not flee the party in face of this week's scandal.
Regional committee members and leaders had already put their hands up to form a "provisional board" to go forward, he said.
"I would be very surprised if there was anyone other than John Stringer left [on the party's board] by the end of the week. Very surprised," he said.
He refused to say whether he had fallen in love with Ms MacGregor, responding: "I fell in love with a wonderful woman 23 years ago...I have always been in love with my wife."