Flirting is when you flirt with someone on a regular basis without the intention of making any kind of relationship. You can have a girlfriend but still flirt with other girls/boys. Some of the signs that what you have can be classified as flirting are: The two of you are always flirting, You are not sure what to call the type of friendship you have with the other. You have insecure feelings for the other.
If you go out, people will assume you are together.