In short, only God knows. It is his role to be the judge of all of us (I don’t want that job as it would be a hard burden to bear). In paragraph 2283 the Catechism has this to say, “We should not despair of the eternal salvation of persons who have taken their own lives. By ways known to him alone, God can provide the opportunity for salutary repentance. The Church prays for persons who have taken their own lives”.