Help me i feel jelous when this girl talk to other guys ? HOW am i suppose to stop feel in that way ? HELP ME?

year ago i met with this girl from my laboratory courses . We were kind of getting close and then i find her hanging out with this other guy . so it kind of messed up my head and i was kind of ignoring her ..well to put it in this way i kind of pushed her aside though she was acting the way she use to with me . well now after a year we are in the same group again and she is showing more interest in this other guy in the group them me.and it really makes me nut . i know its not her fault the reason why i am streassed cause for once she make me feel like thats she likes me a lot. now she dont even look in my eyes when she talk to me, and i am still like pushing her aside. cause there ius aother girl in my group and i dont want to talk to her if am ot talking to theis other girl.i dont want any one to be ignored and feel like pushed aside.how can i stop feeling in that way?how is is it possiable to make it all right?is there any way i can stop feeling jelous when she talk to other guy?Help me i feel jelous when this girl talk to other guys ? HOW am i suppose to stop feel in that way ? HELP ME?
I'd like to know too, but dude seriously just pretend that they're all friends, and her intentions are just to keep it as friends. If you think otherwise, you'll get hurt.

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