Does divorce occur by whispering something that implies separation, without prior intention or knowledge of allusive divorce, especially if the wife is later reconciled and there is doubt about the intention?

What the questioner uttered is unclear. In any case, it does not constitute a divorce as long as he is not certain that he intended divorce by it. His wife remains under his marital bond and does not need to be taken back, as no divorce has occurred. The questioner is advised to disregard the whispers and schemes of Satan that he feels, to seek refuge in Allah from his evil, and to occupy himself with all that is beneficial.