Short-term relationship, long-term hoovering attempts still.

Anyone here suffering the consequences of a short-term relationship with someone wBPD? I mean strictly less than 6 months, yet years later they're still trying to hoover? Maybe intense, but e.g. you didn't move in together/make actual serious plans.

Has flagging the illogical nature of harassment longer than the actual relationship done anything? Anyone managed to actually get it to stop?