Best friend going out with crush?

well shes going out with my crush devon,i havent told her about me liking him, shes a total jack..t=]]. she NEVER talks to him i always talk to him though i mean i gave them enough time to talk but they dont even look at eachother is he trying to get to me and shes just going out with him cause she feels like it?? i LOVE HIM!! and if u have flirting tips the'll help.. BUT PLZZ!!!HELP='[ should i tell her and how?