concerned friend

I'm getting really worried about one of my close friends. he texted me saying how he is having a really hard time and I'm trying to always be there for him and support him so he knows that I care about him and love him. He said how he hasn't had a lot of motivation when it comes to school or texting people, and I understand that and I would never want to add any anxiety onto him to reply super fast. I'm just getting scared because I haven't heard from him for a bit and I just texted. I don't want to overwhelm him, I just need to know he is okay. idk what to do