How to help him?

Yesterday a boy I'm talking to said he was not okay and wished he didn't exist, I tried to comfort him but he said he was gonna sleep, so I sent him a message and he didn't answer anymore. He doesn't have depression, I think he was just in a bad day. He still didn't reply and I don't what to do. Should I text him asking if he's okay or should I wait for him to text me back first? OBS: if it helps his star sign is cancer and he is an enneagram type 7.
How to help him?
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