What do you mean by texting your girlfriend for a long time or just not returning?

Depends on whether it happens often. If this happens often, I think it should be you. Then maybe she felt your sincerity before agreeing to you. But in fact, she doesn't really like you. Maybe she just has a crush on you, so you should keep trying. If it doesn't happen often, it goes without saying that something must have gone wrong. If you have been talking for a long time now, it may be that you are really familiar with it.