What sign is he trying to give?

Maybe its you who have taken this the wrong way. He sees you as a best friend, someone who he can be open to, and give him advice. He probably has something 2 do now, and he doesn't see it as a problem spending less time with you because to him you are friends. If you meant more than that 2 him, at times when he is not around, he would call or text u, to tell u he can't make it. So u have 2 accept things the way they are, and don't develop some silly ideas about him.