These are some of the more subtle clues - keep your eyes open - you may have more guys flirting with you than you realize!!!
- He remembers little things you mention in casual conversation.
- It may take you by surprise. You might have been talking when he was around and two weeks later he'll say, "Well, you like orange fizz..."
- His voice changes when he talks to you in a group. He may say "Hey." to everyone with you, but the "Hey." to you is a little different.
- His voice gets softer when the two of you talk.
- Sometimes he stares straight into your eyes.
- His eyes get 'soft' when he looks at you. They change slightly or get relaxed around the edges. It's subtle, but you can tell if you watch...
- (You may already be aware of it at a subconscious level - that's what made you start wondering if he likes you...)
- When he's near you or talking with you, his eyes travel in a little circle around your face and land back on your eyes. (Like he's looking at your whole face - then back to your eyes.)
- He watches your lips. (Dead give away.)
- His friends start asking you questions - if you haven't met him yet - they may ask what your name is. Or may ask you what you think about 'him.'
- If his friends are paying attention to you after he's been staring at you - it can mean that he's been talking about you.
- He tells you that you smell nice...
- (No hidden meaning here - it's a good thing.)
- He might act weird around you or seem very nervous. His behavior may just plain change when you're around.
- If he's normally quiet, he may get louder, or vice versa. It's the difference in behavior that's the clue.
i got this from click