boyfriend probs

So lately my boyfriend has been acting very, very strange. For example, he calls me babe, would write a sweet little good night text, would text me in the morning with hearts, and tell me all the time of how much he appreciates me, etc. For a little over a week now, there has been NOTHING like that. I have been so worried lately, so I decided to text him last night. I told him he was acting differently and wanting to know if I did something thay bothered him. He said that nothing was wrong. I told him I was worrying and his response was "well don't". (Last time I told him I was worrying, he sent a whole paragraph on why I shouldn't). It's not that I expect these things, it's just very strange to me that he's doing it all of the sudden. CAN SOMEONE PLEASE HELP ME!!!