There are several ways to tell if a guy likes you. Here are some common signs:

1. He pays attention to you: If a guy likes you, he will often make an effort to listen and remember things you say. He may also ask you questions to get to know you better.

2. He makes an effort to spend time with you: If a guy is interested in you, he will try to find ways to be around you. He may suggest activities or events to do together, or he may try to join you in activities you enjoy.

3. He shows physical affection: Physical touch is often a clear sign that someone is interested in you. If a guy likes you, he may initiate casual touching, such as hugging, touching your arm or shoulder, or finding excuses to be physically close to you.

4. He compliments you: When a guy likes you, he will often give you compliments and praise. He may compliment your appearance, personality, or achievements to make you feel good about yourself.

5. He shows jealousy or protectiveness: If a guy is interested in you, he may show signs of jealousy or protectiveness. He may become slightly possessive or show concern when you interact with other guys.

6. He remembers small details: When someone likes you, they tend to remember little details about you. If a guy remembers things you've mentioned in previous conversations or brings up topics that are important to you, it's a good sign that he is interested.

7. He initiates contact: If a guy is always the one reaching out to initiate conversations or make plans, it's a strong indication that he likes you. He wants to keep in touch and stay connected with you.

Remember, these signs are not foolproof, and everyone's behavior can vary. It's essential to communicate openly and directly with the person to understand their true feelings.