What should I do?

Hi. I have a friend. We were really close to each other last year but then we kissed and ghosted each other. Last few months I've seen he's been going through some bad times and I was the only one who actually cared and were there for him. Eventually he asked me out but I got really scared that I would mess up and drag him down with me, so I declined. We didn't talk since then. Now my friend couldn't reach him through phone for a few days, so I tried too. Nothing. I tried texting him. Nothing. I noticed that his instagram is just blank, he didn't open any snaps for a few days and last time he was online on messenger was a week ago. Should I be worried? Should I try to reach him some other way? Or just leave him alone?