Mood:
Everyone wants to check/know whether his sweetheart really likes him or not.If you want to do so here is chances...
EYE CONTACT::
Ask your girl to sit&chat with you,if see keeps seeing you/talks straight to your eyes,she might be affectionate to you.
MIRROR TEST::
If your girl repeats what you are doing it shows that your girl is watching you all along.
MOOD::
If your girl talks to you so causually,you can decide that you are not an outsider to her.
NECK::
Exposed neck is a good sign,that your girl really don't hesitate with you.