1. He may be expressing a state of reflection and thinking about his life or feelings. At this time, he may feel very confused and don't know what he really thinks.

If you have quarreled recently, or have other contradictions, he may be expressing his dissatisfaction, indicating that he doesn't know his position and role in your heart.

3. The question of "Who am I" can also be an exploration of self-knowledge. He is exploring his heart, and he may need your understanding and support at this time.

No matter what his specific intention is, I suggest you communicate with him, understand his real thoughts and try to find a solution to the problem.