Relationships
It was revealed in the first episode that Maggie and Wayne had a relationship while they were at the academy together.
It was clear from the start of the series that P.J. was interested in Maggie and they kissed at the end of Season 2 but decided it meant nothing and it didn't continue. They had a one night stand in season 4 in a mine shaft but Maggie got scared and the relationship ended.
Maggie and P.J first kiss in the Season 2 finale. While P.J. wants to pursue a relationship, Maggie is more cynical about relationships started at work. After the two are trapped in a mine together in season 4, they decided again not to start a relationship. They finally get together at the end of Season 4, keeping it a secret from their colleagues.
Maggie's first actual relationship doesn't start until the start of Season 5 when Ben Stewart arrived in Mount Thomas and immediately falls for Maggie, and he and P.J. compete to win Maggie over.
Maggie and P.J. became engaged at the end of Season 6.
Read more about this topic: Margaret 'Maggie' Doyle