Am I over reacting

So my FWB had been MIA for a little over a week. I last saw him 4 weeks ago when I got back into town. We talk maybe once every two to three days not a lot because we are both busy people. He said he was going though a rough patch and that I didn’t do anything wrong. That was 8 days ago. He has a history of depression (we both do). I’m start to get worried I sent him a Snapchat that he has not opened and 3 texts over that past few days. I don’t want to sound crazy but I care about this guy a lot and I’m worried about him.