We need to encourage our older teenage girls to see our younger girls for what they themselves once were -- on the precipice between self-acceptance and self-loathing, needing the encouragement of the older girls they so admire and respect.
You don't have to tell your friend that you're not interested in dating -- he already knows. My guess is he's not going to be happy with the status quo. Once the cat is out of the bag, it is very difficult to put him back in.
When girls are regarded as little more than property to be transferred from one family to another through marriage, they are often violated physically and sexually by their soon-to-be husbands and family.