What does it mean if a girl chooses to sit next to you?

A seat choice is easy to make and easy to change, so treat it as a light positive rather than proof. Look at what the choice tells you and what it leaves open. She picked you over other options, which means she found the conversation or the presence pleasant enough to be near. That is real information. It does not tell you whether she is thinking about a second date or whether she likes you as a friend. Most of the ambiguity clears up in the first few minutes of talking, when you can see whether she is actively engaging or just being polite. If she asks questions, laughs at more than the obvious jokes, and returns to topics you raised, the seat was doing its job. If she keeps drifting toward other people, the seat was probably just convenience.

Match your follow-up to the amount of attention she gave you, not to the fact that she chose you. If the evening was relaxed and she engaged with you the whole time, a warm, specific message that refers to something you actually talked about lands well. It shows you were listening and leaves room for her to answer. If the connection was more tentative, keep the message lighter and easier to ignore. You want replies that a girl can answer in one line if she wants, and can extend into a real conversation if she is into it. The message should carry a detail from the night, a question she can actually answer, and nothing that asks her to agree that the night meant something. Skip any line that assumes a relationship or pushes for a plan she has not mentioned.

Send the first follow-up within the same day or the next morning, while the night is still fresh and she can easily place who you are. Waiting several days makes it feel like you forgot, even if you did not. If she replies warmly, keep the conversation moving for a few exchanges, then suggest something concrete if the chemistry is clearly there. If she answers briefly or does not answer, give it a week before trying again, and make that second message even lighter, something about a shared interest or a funny thing you saw. If two gentle attempts go nowhere, let it go. Silence after a friendly night is usually a no, or a yes that got buried, and pressing harder only makes the next conversation harder.