Let me guess. They got a better offer not to reunite.
Perhaps more like lingering hard feelings: https://www.youtube.com/watch?v=IcS4vBisJLo (Frida “nudges” Agnetha)
Towards the end, begin 2:40 for those that want the incident, and skip most of the song and on-screen comments
Maybe one of them is pulling a David Byrne?