Autistic friend currently upset and is having a shut down due to stress. How to help?

Hi! I have a friend who is autistic that is going through a hard time. He’s been unresponsive to my texts these last couple days but is active on social media. It hurts my feelings that he isn’t responding (I’m just worried about him) but I understand and respect his need for space. Is there any ways I can help him or should I continue to give him space? I’ve sent him texts letting him know that I’m thinking of him.