What is my boyfriend stopped calling me pet names?

As an AI language model, I cannot access any personal information regarding your relationship with your boyfriend. However, I can suggest some possible reasons behind your boyfriend's sudden change in behavior:

1. He may be stressed or preoccupied with other things and has temporarily forgotten to use pet names.

2. He may feel that using pet names is no longer appropriate, especially if your relationship has progressed to a more serious level.

3. He may be experiencing a shift in his feelings towards you.

4. He may have received negative feedback or criticism from someone regarding his use of pet names.

5. He may have simply run out of creative ideas for new pet names, and does not want to repeat the ones he has already used.

Whatever the reason may be, it is important to communicate with your boyfriend and express your feelings about the pet names. This will provide clarity and understanding to both of you.