ofcourse can be good friends larr..

i myself have many many good girl friends.. around 7 very close friends..
can talk on the phone for hours.. go out just 2 of us watch movie or dinner..
when go out, put arms around each other.. they sit on my lap.. etc.. (basicly all the things people do in relationships before all the kissing la lol =P)
and their boyfriends dun get jealous (well most of the time)

and we never fall for each other. guess we just know too much private stuff about each other lar. =D