One thing that many of your group members will either go through or will have friends go through is a breakup of a relationship with a boyfriend or girlfriend.  What’s great about teaching on these things is that you can teach it in a way that you are trying to help your group help others, but when it happens to them, they will be able to draw from that teaching as well.  If you are not sure how what to say to help them in this way, bring someone in who can.