How do you tell if a really flirty girl likes you

I was just woundering how do you know if a girl that is really flirty like you. I think i could have a hint. Last year when we first met she would always bug me for 2 months and i wouldn't give her attention. There was a time she asked if i liked anyone i said yes some girl that is far away. Then later on she tells me she is sorry she isn't far away. I told her about this other girl but she just automatically started saying all this bad stuff about some girl she never met before. By the way this girl that is far away i lied about to see how her reaction is. There was this one time when she had a boy friend i didn't know who he was at the time but she ran all the way to me to give me a hug when i was 10 feet away from her but her bf was almost right next to her because me and her bf came into the mall at the same time but he was just a head of me 5 feet further. So i was woundering this girl that flirts with alot of guys how will i ever know if she has feelings for me or am i just some other guy to her to make her feel special.

Sorry for my horrible grammar
thank you for reading

Flirty girls can be dangerous. They can be insecure and they may not know what they want, especially according to that bf act. It could be that she is just using you because she has some trouble with her bf (makes him jelaous). It can also be, that she is just bored, has some fun and goes back to her bf.

How would you know when a flirty girl likes you?
If she is desperate enough to tell you she really wants to be with you, wants a relationship, and there is no other guys in her life.
Other than that, she just want attention.
Flirty girls might ask you plenty of personal questions and gives you alot of suggestions that she likes you. Don't fall into the trap.

Basically everyone is saying that it is impossible to figure out if a girl that flirts with every guy likes you or not

Why don't you just ask her? Be a man. Don't judge her because she may seem to flirty in your eyes and other peoples eyes. I have had a lot of friends who are called to flirty and they have all dated their boyfriend for more than one year and some even married.What does that tell you?You never know until you ask her.Its impossible for you to never say anything.Just ask her,it won't kill you.You'll live even if shes not interested.There is always someone out there for you.