Okay I have to rant

this guy I really care about I dated briefly well when we were together a few months and I really cared about him but we both mutually decided to break up but like I said I still care about him a lot but I'm not contacting him cuz his gf blocked me so. But today I found out today by a mutual friend that since he has been with this girl he has gone a downward spiral. she has told me that he's dirty all the time like he doesn't shower that he's acting off like he's back on cocaine and that he's sleeping a lot and he quit his job and is living in a dump and that it's filthy inside that his brand new couch looks like he got it out of a dumpster. It really upsets me and worries me because when we were together he quit cocaine because he knew that if he didn't we were done he was always up early for work because I would wake up at like 7 am and talk on the phone on his way to work. And and he worked his ass off I was always telling everyone how proud of him. Since he's gotten with this girl he's gone back down the path that he was on in high school even I've noticed it from his post on Facebook till his gf blocked me I mean I get it it or not my business since we broke up but I care so how can I stop myself from worrying