How can one deal with a fiancé who prevents his fiancée from completing her studies and work, from leaving the house, who suspects her behavior, and disapproves of her interactions with her friends and family?

If your fiancé suffers from obsessive jealousy, it is not permissible to hand over your phone to him, nor to speak with him except out of necessity (such as arranging matters of marriage). Given the existence of this disagreement, it is better for each of you to seek another partner who suits them, because breaking off an engagement is easier than divorce after marriage, and to avoid what might disrupt the tranquility of married life.