Brother and sister incest. Reaction from my 15 year old friend

So I have a friend who knows about me and my sister, and I trust him completely and know that he won't judge me. I also think that he's on our side after he heard the story. After I finished telling him, he just sat there in silence, dumbfounded. He asked me a few questions, and I answered. After he finished asking questions, he sat there in silence again, still dumbfounded and processing the information that I gave him. <br><br>About a week later, I asked him what he thought. He told me that he's glad that I'm happy, and that he didn't care as long as I'm okay. I told him that I'm happy with my sister and that I love her more than anyone else. He asked what would happen if we got caught, and I explained to him that we'll just move far away from our parents and live our own lives. He said that he was glad that I had a plan. <br><br>He's been acting like nothing changed since he found out. He treats both me and my sister normally, and acts like he always did before he found out.