Getting tired of me

I was talking to a really good guy, we talked everyday. Recently he seems like he’s losing interest. I usually have to initiate a conversation with him, it used to be the other way around. Our conversations used to last a long time but now they hardly last for 15 minutes at most. He doesn’t bother to reply to my snapchats anymore. He told me that he really liked me but I feel like he’s losing interest in me now. I don’t know what to do.