Flirtatious?

What is flirt? I wonder how ppl define flirt. For me, flirting is like doing sweet stuff like they're couple but they're not. I asked Ivan, my cousin jz now how he define flirt. He says it's like guy and gal, acting as if they're couple but they're not in a relationship. This include verbally and physically. Maybe. I don't know. What i know is when someone is flirting or flirt too much, u won't know which phrase he/she say is real or fake. It's hard to trust that person if he/she didn't assure u that it's true. If u take things seriously, or sometimes, u take what a flirtatious person say seriously, u might accidentally hurt yourself by falling into the trap without yourself realising it.