The answer is "change/predictability".
The vast majority have been seeing someone, sooner or later their accomplice appeared to oddly change their assessments. A week ago they needed additional time together, this week they need to be distant from everyone else. What gives, and for what reason do they continue altering their opinion?
Individuals, and connections, are never steady; there's dependably change. One reason for this change is a mental conflict called dialectic tension.