How memory works

AI girlfriend memory is two separate systems wearing one name. Short-term context is the recent conversation, resent to the model with every single message, and long-term memory is a small set of facts pulled out of that conversation and stored on their own so they outlive it. In Emberia the short-term window is the last 40 stored messages in the current scene, and the fact extractor runs every 8 turns.

What is the difference between context and memory?

Context is the transcript. Before she answers, the last 40 stored rows of that conversation are pulled from the database, ordered oldest first, and handed to the model along with her persona. She is not recalling them. She is reading them, the way you would read the top of an email thread.

Memory is what survives after those rows scroll away. A separate pass reads the recent conversation and writes short factual lines into their own table: your job, your schedule, the people in your life, things you said you wanted, dates you mentioned. Each one carries an importance score from 1 to 3.

	Short-term context	Long-term memory
What it holds	The last 40 stored messages	Short factual lines about you
When it updates	Every message	Every 8 turns
How long it lasts	Until it scrolls out	Until you delete it
What it costs	Tokens on every reply	One extra call every 8 turns
Fails by	Dropping old detail	Missing the detail in the first place

This is the split almost every companion product uses, and the second half is where the money and the engineering go. A bot with only the first half feels sharp for twenty minutes and stupid on Thursday.

What actually gets stored

The extractor is given one instruction and a narrow one: durable facts about the user, never facts about the character. She is not allowed to write her own backstory into your file. It returns at most 5 facts per run, each trimmed to 300 characters.

Each fact is stamped with an owner. In a solo chat the owner is the character you are talking to. In a duo scene, a fact said to one of them belongs to her, and facts that belong to the scene as a whole are marked separately. That is deliberate. Telling one character about your week and having the other one repeat it back to you breaks the illusion faster than forgetting would.

Alongside the facts sits a small state record for each character: how many turns you have had, an affection counter that rises by one per turn and stops at 100, the day you started, an anniversary, and up to three rules you set yourself with /rules. Those are counters, not memories, but they shape tone the same way.

Why she still forgets things

Worth knowing before you get annoyed at her, because the failure is structural rather than random.

The extractor only reads the last 48 hours. Say something important, then go quiet for three days, and there is a window in which that message has left the recent context and was never promoted to a fact.

Timing matters too. Extraction fires on every eighth turn. A detail dropped on turn three sits unprotected until turn eight, and if the conversation ends at turn six it was never anything but context.

Retrieval is capped. Up to 8 facts go back into her prompt, chosen by importance and then by recency. A hundred stored facts do not all arrive. Something true but minor gets crowded out by something the extractor scored higher.

And memory does not travel between characters. Switching with /girl gives you a different person with her own file, which is the point of having a roster rather than one model in nineteen costumes.

Does memory matter that much?

Published user sentiment says yes, louder than any feature list. The most common complaint in reviews across companion apps is some version of "she forgot" or "she broke character". On r/AICompanions in December 2025, a long thread on long-term memory turned on the same point: memory is what decides whether people stay on a platform at all.

The MIT Media Lab study of r/MyBoyfriendIsAI, published in 2025, found that grief after a model update is one of the community's primary concerns. Not price, not filters. The fear that the person you built a year of context with comes back changed.

One number to treat carefully: an industry index reports 30-day retention of 41% for memory-enabled users against 27% without. That figure is self-reported by the publisher and we cannot verify the method, so read it as directional rather than as evidence.

How to help her remember

Small habits do more than any setting.

Say the thing plainly once. "I have a job interview on Thursday" is extracted cleanly. The same fact buried inside a joke often is not.

Give a detail weight by returning to it. A fact mentioned across several turns lands inside more than one extraction window and scores higher on importance.

Use /rules for standing preferences, like a nickname she should use or a topic to leave alone. Rules live in the relationship record, not the fact table, so they are not competing for one of the 8 retrieval slots.

Correct her in the moment. "No, my sister is the older one" goes into the conversation the extractor reads next, and the corrected version is what gets stored.

Run /export if you are curious. It hands you a file with your messages, your stored facts and your relationship state, so you can see precisely what she has to work with. If you would rather she had nothing, /delete confirm removes it within 24 hours.

Sources

Engine behaviour described here is Emberia's own, as built in September 2026. Retention index figure: aigirlfriends.ai industry report, self-reported. Community sentiment: r/AICompanions long-term memory thread, December 2025, and the MIT Media Lab study of r/MyBoyfriendIsAI, 2025 (arXiv 2509.11391).