Is it obligatory for one who has engaged in fondling and homosexual practices to throw himself from a high place, and is it obligatory for him to divorce his wife, knowing that he wishes to repent of these sins?

You must immediately initiate sincere repentance from the abominations of sodomy. The conditions for repentance are to abandon the sin and distance oneself from its causes. Sodomy is a grave abomination. Means that lead to it (like foreplay) are forbidden, but they do not necessitate the حد (prescribed punishment). The حد for sodomy is the killing of both the perpetrator and the one upon whom it is perpetrated. The Muslim ruler is responsible for implementing these hudud. You are not permitted to commit suicide. We advise you to complete your marriage and preserve the other half of your deen (religion), associate with good people, and frequently supplicate with prayers such as: "O Allah, I ask You for guidance, piety, chastity, and self-sufficiency."