What should I do?

Hello, so I am having a dilemma with my partner. Recently he has been very distant and dry when we communicate and when I asked him about it, he says that he is stressed and overwhelmed. So I provided him with space and support, but it’s been a week and a half already and he continues to be distant with me, such as taking 6-8+ hours to respond to one message or just to have a simple conversation. I have explained how he has been making me feel (ofc I understand that he is feeling very stressed) but he told me “well what do you want to do about it? Because this is going to keep happening.” I honestly do not know how to respond to that. Can someone please give me advice.