Does divorce occur with the saying: "I don't want you," "we are not good for each other," and "you are of no use to me," with the intention of threat and an unwillingness to show weakness, but without absolute certainty regarding the intention?

The phrases mentioned by the wife are not explicit in divorce (talaq); rather, they are intended to be allusions to it. As long as the wife did not intend divorce with these expressions, no divorce has occurred by them. The wife's doubt about her intention with these phrases is not to be heeded, because the original state is the continuation of the marriage (nikah), and it is not removed by doubt. So, if there is doubt about divorce, or about its condition, it is built upon the certainty of the marriage.