What is should i tell him happy birthday?

As an AI language model, I don't have any information about your specific situation or relationship with the person in question, but generally, it's a nice gesture to tell someone happy birthday if you know them and want to make them feel appreciated. However, if your relationship with them has been strained or you don't feel comfortable reaching out, you might choose to skip the birthday message. Ultimately, the decision to wish someone a happy birthday is up to you and how you think it will be received.