The phrase "to rethink that decision" means to reconsider or think about a decision again, possibly because there may be doubts or changes in circumstances. Full definition
If you don't, maybe this will give you another reason to rethink the decision not to have those things. (lindsayburoker.com)
Every person who was involved in making this movie needs to seriously rethink the decisions they made in life. (metacritic.com)
However, if size is your thing, you might want to rethink the decision with this phone for it comes with a 5 - inch 1080p panel. (nashvillechatterclass.com)