on again, off again
Irresolute; wavering in certainty or constancy; inconsistent. Commitment from the board regarding the merger of the two companies has been on again, off again since the plan was first proposed. Mike and I were pretty serious for about a year, but our relationship has been on again, off again ever since we graduated.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
see under off and on.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.