What is gave him my number?

"Gave him my number" typically means that a person provided another person with their phone number, either in person or through messaging. This could be done for a variety of reasons, such as intended friendship, romantic interest, professional networking, or simply as a means of communication in case they need to reach each other in the future. The action of giving someone your number can be seen as a friendly gesture, but it can also lead to potential pitfalls such as unwanted attention or spam messages.