Exclusive to "Manicmonkey5" & "onomatopoeia1337", "Hevyk3vy" & "neatoqueenrl", "ChisTheBlond" & "Pinapul", and "LemonGerth" & "GracefulGazelle". These are all couples who met in Rocket League and became engaged to be married, similar to the Rocket Husband/Wife titles.

Source:
https://www.reddit.com/r/RocketLeague/comments/cc5e0p/i_married_a_girl_that_i_met_on_rocket_league_and/
https://twitter.com/neatoqueenRL/status/1166509336832688128
https://www.reddit.com/r/RocketLeague/comments/g40vpb/rockets_engaged_encounter/
https://www.reddit.com/r/RocketLeague/comments/h81ksm/two_of_my_best_friends_got_the_rockets_engaged/