The suggestion about looking into co-dependency is excellent. Alanon meetings have a membership requirement "that there be a problem of alcoholism in a relative or friend". I don't know anyone who doesn't qualify. It's free, you don't have to say anything.

Criminals are generally very charming, and they are super sentimental (crying and shaking about the baby etc) when it suits them. You have no idea why the pregnant girlfriend who had the miscarriage left him, you only have what he's telling you. Without a doctor's report, I quite seriously wouldn't be too sure about the HepC and liver cancer either. I know that sounds really callous, but trust me, I've worked with addicts and criminals for the past 30+ years and I won't even get into all my personal escapades in this regard.

If this man is truly sick and truly seeking help, you are in no way the person to help him anyways. And no, you should not be a therapist. The clients would eat you alive.

This man could very well be a good guy, but he is drinking. Stay away. Be friendly, but don't be his friend. And really, check out Alanon, it could change your life in so many ways.