My nephew says he likes me, but he doesn't know how to deal with it.

This is a very sensitive and complicated problem, which needs your careful handling. Here are some suggestions:

1. Stay calm: Although it may shock or embarrass you, stay calm. Don't overreact to emotions.

2. Keep your distance from your nephew: It may be wise to keep your distance until you figure out how to deal with this situation. Make sure there are proper boundaries between you and avoid being alone.

3. Ask about his motives: Try to understand his motives. He may say such things out of admiration, dependence or other emotional needs. Knowing what he really thinks can help you cope better.

4. Educational: You can convey correct ideas to him and let him know that this kind of behavior is inappropriate and may have a negative impact on your relationship. It is important to teach him to respect the boundaries of others.

5. Communicate with other family members: Consider sharing this situation with other family members, who can provide support and deal with this problem together. If this is not the first time in the family, you may need to consult a family doctor or other professionals.

6. Seek professional help: If this problem bothers you, or you feel that you can't handle it, it is wise to seek professional psychological counseling. Professionals can help you deal with this emotion and provide appropriate guidance.

Most importantly, respect the feelings of yourself and others. Dealing with this problem in an open and frank way may help you build better communication and healthier relationships in your family.