Most Helpful Girl
Listen as much as you talk be respectful open and honest about your needs and expectations and compromise to meet hers as well and devote a fair amount of attention to her without being overbearing.
Most Helpful Guy
Well one, your young and they are too so you shouldn't expect to find a life partner off the back, most women your age have no idea what they want in a man and wanna date around.
two, if they leave relatively quickly there might be something about your personality or lifestyle that they find unappealing, you should evaluate your self and try to figure out what it is.