==Is he single===
There is no way to know. Every person acts in a completely different way. But here's the most common way to know...
Rule of thumb,
1) if he's happy, charismatic and smiling = He's taken or a playa
2) If he's needy, acts shy, or desperate = He's single
The irony is that most people act very unattractive when they're single, and only after they get someone do they start acting attractively. Irony of life :) Same with girls. The unapproachable ones are waiting to get approached. The approachable ones are taken, lol.
===Signs he's interested===
- The number one sign he is interested. You ask him out and he says yes. (99% correct)
- The number two sign he is interested... When he notices you, his behavior changes. It doesn't matter how he acts. What matters is that his behavior is different when you are in the room then when you're not. He's laughing, having fun, notices you from across the room, and suddenly gets quiet... Or vice-versa. The indicator is change of behaviour when you're around, not the type of behavior. (95% correct)
- You hold eye-contact and he wants to keep it. Doesn't mean he's good at keeping it at long times. The key word here is *wants* to keep it. But if you keep eye-contact and keep looking his way (in his eyes), he always find reasons to look back your way (80% correct) ===> this one can be confusing because it can be messed up due to shyness or upbringing, so he can keep looking away. The give away is if he re-initiates it.