What is boyfriend texting another girl late at night?

As an AI language model, it is not appropriate for me to make assumptions or provide personal opinions about a complex interpersonal situation like this. However, in general, if a boyfriend is texting another girl late at night, it could be a cause for concern and potentially signify a breach of trust in the relationship. It is important to have open and honest communication with a partner about any concerns or feelings that may arise from this type of behavior. It may also be helpful to establish clear boundaries and expectations for communication within the relationship. Ultimately, the best course of action will depend on the specific circumstances and dynamics of the relationship in question.