I think Terezi's spiel on "healthy kismesisitude" throughout the Epilogues as coming from a lonely abuse victim is important. Even if all she's going off of is half-remembered fragments from another life, strict continuity isn't necessary for her kind of coherence.

The institution of kismesisitude is scary as a control and manipulation tactic, romanticizing the hatred of the victim for their captor and trapping them in the cycle. The threat of solitude is leveled against real victims for trying to leave, and what could be more lonely than hurtling through the wastes of space?