Update: he’s ghosting everyone. Should I be concerned?

I posted here a couple days ago asking if I was being ghosted. Our last interactions were good and he’s the one who brought up our relationship and wanted to define that he wasn’t ready for commitment/likes what we have/needs time/but isn’t closed off to the idea of us being official sometime. He unfollowed me on IG but I’m not blocked anywhere and he quit our mutual job. He has not responded to our managers asking him employment questions or even our mutual friends at this job. One friend has called and left him voice messages and… nothing. Another coworker felt so concerned she went to his house and received no answer from knocking or their ring doorbell (This house has several adults living in it). She even called his dad and said his response made her feel weird. Allegedly he just said that this person of concern was “alive and breathing” last he checked and “he’s going through family issues that I will not be discussing with you”. After she called, we noticed our messages had been read but she’s feeling worried that nobody has still received anything after that interaction. She claims it’s totally out of character to not even get a “hey I’m ok - sorry” type of message. I have really no idea what to make of this whole thing. We were newly seeing each other but we’ve known each other for years, so it’s a difficult ghosting situation.