You don't - if it is a boy your interested in and it feels right at the time then do so but take your time to get to know him first instead of just jumping into something.
Ask him right out
Ask him.
You have to get to know him first, before you ask him out.
You should go up to him talk to him and be friends with him then when the time is right you go and ask him. :)
well just ask him! you only have one life....and the worst thing he can do is say "no i don't" and you will live, right?
The best way to know is to ask him.
You will never know if you don't ask.
Ask him
ASK
how you know when a boy has a crush on you is when a boy looks at you all the time. or text him and ask or call just be yourself about it when you ask
First, you get to be really good friends. When the time is right, you ask him.
You cannot know for certainYou cannot know unless you were to ask them. Even then they could be lying. Ask the boy and the girl that you believe the boy is going out with. If they both respond yes. Then chances are good that they are going out.