ghosted

so I have this best friend who I have knowned for around 2-3 years now and we have been pretty open to each other and supportive. so earlier this year he got diagnosed with anxiety and depression (I don't want to expose too much) and I have been here supporting him and listening to him whenever he needs to talk or open up. recently it has been getting kinda worse, so I have been making sure that I give him more love so he knows he is loved. but recently I texted him a couple days ago and he hasn't responded for a while. I'm trying not to overthink it and take it personal and make it all about me. I know he might need time for himself and he is going through a lot. I'm just scared that the "ghosting" (its not tho) will continue and I might lose him since we haven't been talking. this has nothing to do with me and he might just need space and I'm doing my best to be understanding and be there for him even when he isn't talking to me. I just don't want to lose him. and I'm scared.