My gf keeps checking out other girls when im out with her!?

im bi, shes les; she doesnt like me showing , or my legs when im out in public with her, n she constantly checks out girls n openly ses "wow...*licks lips*" n then looks at me n goes "i like her =]" n ill be all "yeh i can tell." n she asks whats wrong n ill jus tell her nothin n keep walkin n ignore her 4 about 5 minutes. she only checks out gothic chicks or girls showin alot of or who have an apparently "nice" ***. what do i do?? i mean i -am- mildly jealous. anyway she claims she loves me "shat loads" but i have no idea wot 2 do about it. n ma mates have noticed n reminded me that she knows its "look but dont touch" buh goshhhH!!! =[ wot do i do?!?!