This is why.
If she's not into you, she will either tell you or her mannerisms will sell her out.
Here are 4 reasons why she's not attracted to you.
1.She sees you as a friend
For her, she may see nothing more than just a friendship. She might even know that you like her but won’t encourage you to pursue her because she wants to maintain your friendship
2.She’s eyeing someone else
She probably hasn’t paid much attention to you because she’s busy eyeing someone else.
3.She doesn’t find you attractive
A woman may not be interested in you because she doesn’t find you attractive. If the attraction is not there then there’s no point to pursue it.
4.She can’t stand some of your manners
Maybe she’s thought about you in a romantic way but there are some manners that she simply can’t tolerate and are a deal breaker for her.