Relationship Problems

So me and my SO have been in a relationship for quite awhile and lately he has not been answering my texts as much as he used to. This is really weird because in the begining of the relationship he would always answer my texts immediately and he would usually start conversation. He is really good at starting conversation a in person which I am not. I am usually pretty awkward in person and I suck at starting conversation. He was talking to me though and he said that he wasn't going to leave me. I just don't know what to think and I was wondering if I could have some help or opinions of why he isn't answering my texts and if he still likes me or not.