your **** should tingle
if they are finding ways to touch you on the arm or shoulder , if you like the other person and you decide to kiss them touch them on the face biggest sign someone has feelings for you .
If they are only acting that way with you especially if they are physically touching you. And if you get chills from those touches, then go it in my opinion.
Take notice if they flirt with EVERYONE or if it's just YOU they flirt with.
Your heart will tell you
Your body will move you
Your mind will 'fool' you
Gotta choose between the three signals.
When it's serious it's called foreplay.
When your balls are bouncing of her chin