Why did he stop talking to me, after he showed many signs that he actually cared about me?

He stopped talking to me altogether pretty much and if he does, its like once every 3 days and he's a completely different person. He's brief and I feel like I'm talking to a shielded version of him - by the way, he acts differently when he's in public. He acts especially differently around his "group (girls and guys)" than he has with me when were alone. And he also (I'm pretty sure) has tried to make me jealous several times. I just don't understand why he would do this. Is he scared of having actual feelings? Is he running away because he's in fear? And he has consoled me when I have been upset and I have never been consoled by someone like he did with me (an example of a sign of caring for me…?).