How can I support a boyfriend who asked for some space when he has troubles at work?

My boyfriend is having a tough time at work. Currently, he took a break from work because it has been really stressful to him and distanced himself from me. He can stay a day without calling me or texting, or replying to my messages. He claims that he loves me but just needs space. Very hard not to take it personally because we have been really close
How can I support a boyfriend who asked for some space when he has troubles at work?
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