i have been in the exact same situation and you tell him and then ask if he likes you back and if he does then say do you wanna date or something like that and if he doesnt then he doesnt
Leave them alone!
Leave them alone together. Find someone else to like.
Try flirting with him/her, but not in front of their girlfriend/boyfriend. But then again, be friendly, you may want to be FRIENDS with them first.
speaking as a boy, i say that you try to take your mind off it by doing something you love and just do that until you like someone else.
No Justin Bieber does not have a girlfriend. He is totally single.
Don't. Simple as that. If he has a girlfriend, he's already made a commitment and like it or not he's with her. You don't want to be a home wrecker. Trust me. Go look for someone else and you'll be happier in the long run.
If someone is taken: don't flirt with them, don't gain feelings for them, don't make them gain feelings for you, don't make them confused about who they want, & don't be a homewrecker.
Respect that he is already in a relationship. If he is worth anything, he would break things off with the other person before getting involved with someone else.
Like dating someone. Like someone's your girlfriend/boyfriend then your going with them
if he has a girlfriend maybe he isn't your true love.....think about it
He could be, but he's not allowed to have a girlfriend.
Find out if they have a girlfriend/boyfriend. If they don't, you are free to ask but if they do have a boyfriend/girlfriend, you should just be friends for a little bit. When they break up with who they were going out with, give them time to heal then go for the move.