You would know by the way she interacts with you. If she's still flirting or giving you a lot of attention, most likely she does like you still. She might even ask you if you can hangout or go to an event with her
If he keeps saying yes when you ask him out, or he asks you out.
Honestly, it all depends on the guy you dated.
She likes to be mean and/or fierce in a nice way:)
take her in a private place and ask her if she is still dening make her feel comfortable around you and then ask her do you like you
If you believe that I have psychic powers, and that even though I do not know who you are or who the girl in math class is I can still tell if she likes you, then the answer is yes, she likes you. And so do I.
see if boy/girl looks at you in a strange way
Maybe she is still trying to get to know the real you,give her time and don't pressure her.
Ask.
shes not sure if she still likes you or shes just being silly or playful trying to be your friend
if she dumped you she may still like you but as a friend be cool she may change her mind
ask her who she likes
lol.try kissing her and if she kisses you back,she still loves and if she rejects the kiss you know that she is over you.