How do آپ know if آپ like someone یا if someone likes you?

If آپ like him then when you're near him آپ might feel tingly, say stupid things یا speak in a different voice then آپ usually do. If he likes آپ then he should be doing the things listed above.

No one can answer that سوال but you.
Each person is different.
If آپ don't know if آپ like him and we are on the internet how am I supposed to know never seeing یا being around either of you?

Have آپ ever liked someone?

I could answer like some others and say, "Girl! Do آپ find yourself thinking about him at random/odd times? Do آپ ever have him pop into your dreams? Do feel یا act different around him... like not yourself, uncomfortable یا all butterflies in your stomach?" but yeah it takes a little time to know. Give yourself a chance to find out. Symptoms vary. Some people are مزید cool and collected but maybe inwardly they just question, like آپ are... give yourself مزید time around this person مزید and THEN you'll really begin to tell & answer your own question. :)

Liking someone is مزید than just a feeling and feelings are deceptive