Initially in Season 1, Jackie tries to help Max talk to Emma and ask her out, she even suggested that Max should ask if Emma would like to watch the satellite launch with him, but over time it is shown that Jackie has developed feelings for Max, who doesn't notice them as he likes Emma. But after Emma leaves the Greenhouse, he and Jackie become an unstoppable team and Max starts to realize that he likes Jackie as more than a friend. He even rejects Emma in the last episode of Season 2 because he it dawns on him that he likes Jackie. He finds her on the beach and confessed to being in love with her. They then proceed to kiss. In S4, we find out Jackie had apparently broke up with him, and he begins to fall in love with Emma sadly.