Trainwreck ex-boyfriend/drinking on meds. Can I help?

I was dating a guy with bipolar, he was diagnosed within the last 3 months by the Army. He is now in therapy, and on a range of meds... I ended the relationship, but am still concerned with his well-being. He chain smokes, and drinks a tremendous amount on the weekends, Fri. Sat. and Sunday... shots and beers... one of the last times I saw him, he showed up at my place very intoxicated, he made himself two drinks, passed out, woke up 4 hours later, made another strong drink, and passed out again until it was time to go back to his Army post and start his day. I told him the next day that he is never to show up at my place again in such a state. I tried to talk to him about his drinking while he was here and drunk, it went nowhere, clearly a bad idea. I assume that he's lying to his therapist who he sees twice a week. I get the impression that he has charmed this professional. My ex is extremely charming, and always reports being 'AWESOME". I have a feeling that I have no options here, other than to let this whole thing go in my mind. Yet, it's hard to watch someone continue to be a total trainwreck. Any thoughts? I had considered contacting a family member behind his back, but it feels very wrong.