What does “play one someone’s side” mean?
In this video, the speaker asks "is your lover playing on your side," to mean "is your lover on the same team as you?" We can understand this as a question asking whether one's lover shares the same thoughts and ideas as yourself, to mean that they are truly a "team." This expression can be used in diverse ways to ask if one is on the same team or aligned with one another. Ex: A: Whose soccer team are you on? B: Blue. I'm playing on the captain's side. Ex: You haven't been performing well at work recently. Are you sure you're playing on our team?