Part of this may be because of the way teenagers see themselves and because of their newness to dating.
Abuse can happen in both dating relationships and friendships. Sometimes people mistake intense jealousy and possessiveness as a sign of intense feelings of love. Threats, intimidation, putdowns, controlling behavior, and betrayal are all harmful forms of emotional abuse that can really hurt — not just during the time it's happening, but long after too. It's never right to be forced into any type of sexual experience that you don't want.
The first step in getting out of an abusive relationship is to realize that you have the right to be treated with respect and not be physically or emotionally harmed by another person. ." is a warning of possible abuse, and a sign that your partner is trying to manipulate you.
In 1995, 7% of all murder victims were young women who were killed by their boyfriends.
In situations of dating violence, one partner tries to exert power and control over the other partner through physical abuse or sexual assault.
Maybe your friend is afraid to tell a parent because that will bring pressure to end the relationship.