Can I Just Sit Back?

One of my closes friends has decided recently to try and make a point with his parents, his first and most stupid move was to not come home one night. His mother was terribly upset as well as Kyle and I were. We did everything we knew to help his parents find him, and they did the next day. I feel really terrible for giving the information i know to his parents but I see no other choice. I don't want to be the kind of friend who will just sit back and watch their friends fail. I want to help him before does anything else stupid. Last night he called me and asked me if he could come over to "Taco Monday" I immediately told him he was uninvited, and that I was sorry to be so rude and mean, but I didn't think he deserved to be rewarded for his recent decisions. A few minutes later his mother called me, I was kind of nervous about how the conversation would go and before she got that chance to say anything I began to apologize for being so mean and how I though he shouldn't be rewarded. She finally cut me off and said that she agreed with me and that my choice was a good one. I felt relieved as she continued to thank me and Kyle for being such good friends to her son, and that she really hopes that we continue to be Friends and that we can help to knock some sense into him. At least I feel slightly relieved that his mother and father agree with me, and don't want me to just sit back and watch my friend fail us, and most importantly fail himself.