make him wish he had more

When you do get a guys attention and he is flirting with you, if he is also flirting with other girls, stop paying attention to him. So flirt with him first make it clear you like him, be confident, then when he's interested in order to hold his interest stop talking to him. Guys like a girl who is not clingy or needy so they'll like that you walked away while at the same time feeling they have to try harder for you brings out their hunting instincts. They'll come find you when they realize the other girls are easier to get to.