As the play progresses, the sentry's feelings for Antigone evolve into a deeper understanding of her courage, strength, and determination. He comes to admire her defiance against Creon's unjust law and her willingness to sacrifice her own life for the sake of family honor and religious duty.
The sentry's evolving emotions towards Antigone are evident in his interactions with her and his conversations with other characters. He expresses a sense of admiration for her resolve and laments the tragic fate that awaits her. He also shows compassion towards Antigone, expressing concern for her well-being and attempting to offer her comfort and support in her final moments.
Ultimately, the sentry's feelings for Antigone represent the broader theme of the play, which explores the conflict between individual conscience and state authority, as well as the consequences of blind obedience to unjust laws.