Do the following phrases constitute a divorce: "You can go, and I don't want her" with the intention of divorce, or "The marriage has reached a critical stage, and it's up to you to stop the problems for the marriage to continue," or "The matter will fail" (in the future tense), or "The marriage will end" without recalling the intention, or "What is the end result of what you are doing?" meaning "The end result of your problems is divorce"?

No divorce occurs with the phrases you mentioned, such as "your wife is leaving, and I don't want her," if they were intended as expressions of complaint and frustration, not as an intention to effect a divorce. The second phrase, "the matter is in her hands to stop the problems," is merely a threat, not a suspended divorce. "The matter will fail" is just a prediction, with no divorce involved. "The marriage will end" is a threat of divorce and does not take effect unless the husband actualizes it; the marriage remains valid. The last phrase is a threat that does not result in divorce. Everything mentioned does not lead to divorce; rather, these are mere whispers (waswas) that should be stopped.