She is actually into you when she remembers little details about what you both have talked about or done, all the while communicating regularly and asking well-thought-out questions that relate to who you are as a person.
She is just being flirty when she doesn’t communicate much, but when she does, it’s frivolous in nature and gets a little naughty.
Some girls do enjoy flirting but have no intention to move it any further than that.
A re flag is rapidly raised into the air when a guy, in the early stages of a relationship, confesses his undying love for a girl or is clingy too soon.
Many guys, especially those who don’t have that much experience with girls and relationships, are enamored by girls far too soon.
Every waking moment is filled with deluging her in compliments, showing how much he has her on a pedestal already.