Where is happiness? Where is love? Where is relief? He continues searching for excuses. She continues convincing him she really really wants to marry him. Is this the guy that is genuinely in love? Well, you already said, that you think Adolin has shallow feelings for her, this episode just supports it. Shallow feelings and no desire to marry as well. He just wasn't too determined about it and let her persuade him, and I think his overall fear to disappoint his family played a big role here.
Or perhaps he is just coming to grips with the extent of her trauma and is expressing concern for her well-being?