Riley and I are close friends, and have decided to go to a movie together while inviting a common acquaintance, Taylor, who knows Riley but whom I don't know very well. The movie theater has assigned seating, and unfortunately we couldn't be seated together, so someone would have to sit by themselves on the other side of the theater. Upon entering the theater Riley suggested that we play rock-paper-scissors and the loser has to sit by themselves. This took me by surprise, as I assumed that since we are close we would sit together. However, I did not object to the suggestion, but ended up losing, and watched the movie by myself.
This upset me, and after the movie went to confront Riley about it. In my mind, Riley should have sat with the closer friend. In Riley's mind, it was a fair thing to do and doesn't understand why I am making a big deal about it. Now that both parties are upset about this, what can we do to resolve this conflict? Also, what can we do to avoid similar situations escalating in the future?
If location matters, this is in the united states.
Note: gender-neutral names were used in an attempt to avoid gender-bias.