What are some ways a girl trys to get a guy jealous and how can you tell if a girl you like likes you without talking to her or having your friends talk to her?

For jealous she probably would try to talk to another guy when your around.

How you can tell she likes is either by her looking at you and can't stop, or she talks and probably wants to touch you when your around and makes you walk slower to spend more time with you in that brief moment