Fray-/Ignota-/Moldu-: attraction for someone that fades after initially meeting with them or not experiencing attraction when they form an emotional connection.
-ap

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Fray-/Ignota-/Moldu-: attraction for someone that fades after initially meeting with them or not experiencing attraction when they form an emotional connection.
-ap
I think the more close are fraysexual and dwinsexual:
Dwin- From word ‘dwindle’. the idea is that this is sort of opposite demi- orientation. A person feels attraction for most of their life, but after a particularly strong/close moment/relationship of a particular attraction, they soon or immediately stop feeling that attraction afterwards, or that attraction slowly dwindles away.
Fray- or Ignota- When someone only experiences sexual/romantic attraction to individuals they are less familiar with, and lose interest when they get to know the person.
But I’m not sure if you mean the person still feel SEXUAL attraction, if so I think unisexual is the more closer:
Uniattraction: Feeling attraction towards one person and one person only for advanced periods of time or one's whole lifetime.
You can go with demisexual, aceflux or abrosexual btw. ~ ap