How do you tell if a guy is interested in you?

How do you tell if a guy is interested in you?

1. Want to know how to tell if a guy likes you? ...
2. A man's body language tells you he's into you.
3. A guy who likes you will make eye contact a lot.
4. He will smile at you frequently if he's into you.
5. A guy's friends can give you an indicator of his interest.
6. If a man gives compliments, he likes you.