Yes, exactly.I believe Demiare is suggesting that you add a notice of some kind letting the player know that they have reached the end of the content available at that time for that girl, similar to what other games have like for example Milfy City
While Cadence storyline progress in obvious way + have a hints (except broken hint for latest event in her storyline):
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Plus Cassandra & Emma stories are very short & obvious too (sex = end of event chain, as party event is not need for good ending). Other girls story events are not so coherent (especially Ashley as you can start to have a sex with her casually by repeatable dinner event without any actual events beside) and end suddenly.
I'm hope that Candance is only who actually have more-or-less finished story and other girls are simply WIP, so it's okay to me. Still other girls events ending much faster then her and it's may leave player frustrated when they no longer "able to progress". This why I ask at least for some "end of current content here, sorry" events for them. Of course, I'm also hope that you will expand their stories to size&detail of Candance story.