When an INFJ likes someone, there are several signs and behaviors that can indicate their interest. It's important to note that INFJs are complex individuals, and their expressions of affection may vary depending on their personal experiences and maturity level. However, here are some common signs that an INFJ likes someone:

1. Deep and Meaningful Conversations: INFJs are known for their love of deep conversations and intellectual stimulation. If an INFJ likes someone, they will engage in lengthy and meaningful discussions, often exploring topics that go beyond surface-level small talk. They will show genuine interest in the other person's thoughts, emotions, and experiences.

2. Active Listening: INFJs are excellent listeners and observers. When they like someone, they will pay close attention to what the person is saying, making eye contact, nodding, and providing thoughtful responses. They may also remember small details from previous conversations, demonstrating their attentiveness and interest.

3. Emotional Availability: INFJs are highly empathetic and compassionate individuals. If they like someone, they will create a safe and comfortable space for the person to express their emotions. They will offer support, understanding, and validation, often going out of their way to help the person through difficult times.

4. Thoughtful Gestures: INFJs are known for their thoughtfulness and consideration towards others. If they like someone, they will often show it through small acts of kindness and gestures. They may surprise the person with their favorite snack, leave a heartfelt note, or remember important dates and events.

5. Protectiveness: INFJs have a strong sense of loyalty and protectiveness towards those they care about. If they like someone, they will naturally feel the need to shield them from harm and offer guidance. They may become more assertive in defending the person's interests and standing up for them when needed.

6. Spending Time Together: INFJs value quality time and will make an effort to spend time with someone they like. They may suggest activities or outings that align with the person's interests, and they will prioritize the person's company over other commitments. INFJs may also enjoy one-on-one settings where they can establish a deeper connection.

7. Nervousness and Shyness: Despite their warm and friendly nature, INFJs can become nervous and shy around someone they like. They may struggle with initiating physical contact or expressing their feelings directly. They might blush, fidget, or become more reserved in the presence of the person they are interested in.

8. Personal Sharing: INFJs are typically private individuals, but when they like someone, they may open up and share more about their personal life and experiences. They will trust the person with their vulnerabilities and allow them to see their authentic self.

9. Supportive and Encouraging: INFJs are natural cheerleaders and motivators. If they like someone, they will be their biggest supporter, encouraging them to pursue their dreams and goals. They will provide guidance, offer advice, and genuinely believe in the person's potential.

10. Intuitive Understanding: INFJs have a unique ability to understand others on a deep level. If they like someone, they will often have an intuitive understanding of the person's needs, desires, and emotions. They may anticipate their actions and provide support before the person even asks for it.

It's important to remember that INFJs can be reserved and cautious when it comes to expressing their feelings. They may take their time to fully trust and open up to someone they like. Therefore, it's crucial to be patient, understanding, and respectful of their boundaries.