There could be many reasons why your son is not talking to you anymore. It could be due to a disagreement or argument that you had in the past, or it could be related to a personal issue he is going through. It's also possible that he is busy with work or other responsibilities and doesn't have much time to talk.

In any case, it's important to approach the situation with empathy and understanding. Try reaching out to him in a non-confrontational way, either by sending a message or giving him a call. Let him know that you care about him and that you're there for him if he wants to talk. If he's receptive, try to have an open and honest conversation to find out what's going on and how you can support him. If he's not ready to talk, give him some space and reach out again at a later time.

It's also important to respect your son's boundaries and to be mindful of his feelings. If he's not ready to talk, it's okay to step back and let him come to you when he's ready. Keep in mind that relationships can be complicated, and it may take time to repair any damage that's been done. But with patience and understanding, it's possible to rebuild your relationship with your son.