1. You will frequently think of him, care about his daily life, and want to share the little things in his life.
2. You will care about his opinion of you, hope to be perfect in his eyes, and be willing to change some of your habits for him.
3. When he encounters difficulties or unhappiness, you will feel heartbroken and want to do your best to help him, comfort him, and even be willing to sacrifice your own interests for him.