Why text threads die
Three causes cover most of it. Every message of yours is a question, so she is filling in a form. Your answers have nothing in them to pick up. Or the thread has simply run its length for today and someone is forcing it. The first two can be fixed with the next message. The third is fixed by stopping.
Answer first, then ask
Respond with something of your own before you ask anything: a reaction, a matching story, a mild disagreement. A meta-analysis of self-disclosure research by Collins and Miller found that people who disclose more tend to be liked more, and that people come to like others as a result of having disclosed to them.
Ask about her words, not your list
In the Harvard chats, follow-up questions were about 40% of all questions asked, and they were the type tied to liking. Among 110 speed daters on four-minute dates, a higher rate of follow-up questions went with more yeses to a second date; other kinds of question made no difference. That part was correlational and face to face.
So the questions that keep a conversation going are not on any list. They are made from her last message. She says the weekend was "mostly moving boxes"; you ask where the boxes were going.
Leave a handle in every message
A handle is anything she can grab: an opinion, a story, a choice. "Good, busy" has none. "Good. I spent an hour assembling a chair and now own a very expensive stool" has three.
What to talk about when nothing is happening
The search is "what to talk about with a girl over text", and it is usually typed on an ordinary Wednesday. The answer: small, current, slightly specific things. What she is in the middle of (a course, a move, a series). Something minor that went wrong for you today. A plan for the weekend, yours first. A harmless opinion to disagree about. In the early talking stage, hold back three kinds of topic: former partners, arguments about politics, and questions that ask her to justify her life. They are not forbidden. They go better in person, with a face attached.
Call back to something she said
On Tuesday she mentions a job interview. On Thursday you write "How did the interview go? I have been picturing the panel as three stern owls." A callback proves you listened, and it gives you a ready subject on a day when you have none. A two-line note of things she is waiting on is not creepy. It is manners.
Photos, voice notes and small games
Text is not the only thing the box can send. A photo of the disaster you cooked says more than a description of it. A meme lands when it belongs to a joke the two of you already have. A light game can carry a slow evening: "Two truths and a lie, I'll go first", or a running bet on something trivial. Keep a game to a few rounds. If she answers the game and never adds a round of her own, drop it.
Match her effort, one message at a time
Write about as much as she does, about as often. If she sends a line, send a line or two, not a column. If she has not answered, do not add a second and third message underneath; a stack of unanswered bubbles is the fastest way to turn interest into pressure. And check the balance now and then: a thread where you tell all the stories is as one-sided as one where you ask all the questions.
Go one step deeper, in turns
In Arthur Aron's 1997 closeness procedure, pairs spent 45 minutes on self-disclosure tasks that escalated gradually and reported more closeness than pairs given small talk. Gradually is the word to keep. In experiments by Kardas, Kumar and Epley, strangers overestimated how awkward a deeper conversation would be.
One practical way down a step: ask how something felt, not only what happened. "Were you relieved or a bit sad to hand the keys back?" gets a better answer than "When did you move out?"
Usually sent: "What's your biggest fear?"
Why it lands badly: it demands disclosure and offers none.
A better version: "Honest admission: I rehearsed ordering in Italian for that trip, then panicked and pointed. Does that happen to you?"
When text is the wrong tool
Anything serious, anything that could be read two ways, any disagreement: say it aloud. A call or the next time you meet will do it better. Text is for keeping a connection warm between meetings, and for arranging the next one.