Flirting is a tricky balancing act. If you are too forward, you will scare the person off. If you are too subtle, they won't know what you are doing.
Of course, there are times when you can be too forward and the other person still won't know what you are doing. You can text someone, "I want to jump your bones" and get a response that just says, "LOL. Skeletons on trampolines."
Here's some advice. If you someone texts, "LOL. Skeletons on trampolines," you need to find someone else. The same goes if you seeing someone who does any of the following.