Well it depends on what u want from the other girl !! if it's just a flex then
go for it just tell her u want to keep it on the down low,.. just make it clear
to her u don't want to mislead her.

If its more, like being your G/F,then you need to sit down with your friend and
tell her that you like this girl, she should understand if she's a really close friend.

At the end of the day if your friendship is strong this shouldn't matter but
remember g/f's come and go but your friend stay for ever.

1~