After the honeymoon phase

So me and my bf have been friends for years. Whenever we first started dating, it was fun. He was all lovey dovey. Sending long paragraphs when I woke up before work. Constantly saying how much he loved / missed me. Talking about our future, and babies and buying a house. Meeting each other’s parents / families. The whole nine! Then, we had a minor, MINOR, argument and it stopped. He’s still sweet but not as aggressive as before. Sometimes I feel like whenever we talk I might be bothering him?? So I think the honeymoon stage has officially ended and I feel like he’s maybe taken a step back. But now I’m getting anxious and paranoid that he might of changed his mind? Does this usually happen? Sos need solid advice!!!!!!!!!