Do you have any sources?

German Finance Minister Wolfgang Schaeuble said that the U.K. would be welcomed back to the European Union if the British decided they no longer wanted to quit the bloc.

French President Emmanuel Macron has said a very similar thing. "Of course the door is always open as long as the negotiations on Brexit have not finished,"

Lord Kerr, the author of Article 50, says "you can change your mind while the process is going on."

European Council President Donald Tusk suggested last year that Britain could change its mind. "In my opinion, the only real alternative to a 'hard Brexit' is 'no Brexit'," he said last October, adding that once exit discussions were over Britain must "assess the outcome of the negotiations and determine if Brexit is really in their interest."

The House of Lords was advised by its own legal counsel: "It is absolutely clear that you cannot be forced to go through with it if you do not want to: For example, if there is a change of government ... There is nothing in Article 50 formally to prevent a member state from reversing its decision."

Mr Timmermans echoed the remarks of French president Emmanuel Macron, who on Wednesday dealt a blow to ‘hard’ Brexit by suggesting the process can be reversed if the UK wished to do so.

He added that Britain would be welcomed back into the EU fold if it changed its mind up until the moment of Brexit in 2019

Guy Verhofstadt has also said it can be reversed.

lol.

Doesn't say it can't be and as I've shown, many EU politicians are open to reversing it.