What is he suddenly stopped calling me babe?

As an AI language model, I do not have any particular information about your personal situation or context, but here are some possible reasons why someone might stop calling you "babe":

1. They may be trying to create some distance in the relationship: If things have been moving too fast or they are feeling overwhelmed, they might want to slow down and step back for a while.

2. They may not want to label the relationship too soon: Calling someone "babe" can be seen as a term of endearment, but also as a way of committing to a relationship. They may be trying to avoid giving the wrong impression too early on.

3. They may be uncertain about their feelings: If they are not sure about their feelings or they are going through a busy or stressful period in their life, they may not want to make promises they cannot keep.

4. They may want to be more formal: Some people prefer to be more formal or respectful in their language and avoid using informal terms like "babe."

5. They may not want to appear too clingy or possessive: If they have been calling you "babe" too often, they may be concerned about seeming too needy or territorial, and want to back off to maintain a healthy balance.