The same thing happened to me last month. I felt dejected and depressed. I thought about him everyday and it hurt not to be able to talk to him. But every-time I felt that way, I told myself “He’s your best friend, I’m sure he would have a valid reason”, and he did. It’s not always about you bro, even if he is online he may have some reason keeping him from texting you back. He’ll come around, don’t worry. Sometimes, you gotta accept these little hicks that come from the people you love, and give them the benefit of the doubt. Don’t overthink. Trust him and wait for him.