You may be misinterpreting his actions for flirting when in fact he may just be acting friendly. If he acted strange after you tried flirting back, he may not think of you in a romantic way. Don't be too down on yourself, there are many guys who will like you for who you are.
You can flirt with the boy and see if he flirts back. If he flirts back he probably A) Likes you or B) just likes to flirt with people. But the most important thing you can do is BE YOURSELF!!!
Flirt back he will eventually come to it and see that he likes you to
She's probably trying to fight you
Then flirt back. You should pluck up the courage to flirt back. Flirting is fun.
She may be bi-curious
Flirt back and make him want you.
Flirt a lot and spend alone time with him and see if he flirts back
i say flirt back a little but not too much
when a guy flirts with you then stops either means hes playing with you, he wants you to flirt now or he liked you then he found another person who is flirting back .
Flirt back who knows , you might score.
well if the person flirts with you more or flirts with other ppl less then probaly just flirt with the person back and see what happens good luck!!!
depends if you like him then flirt a little don't write him a note . if he flirts back he likes you . then ask him out.