Unhealthy relationship....help!!!?

I am 18 years old, and I feel strongly attached to a 46 year old guy who I am friends with......I know being with him is unhealthy especially because he is a lowlife who drinks beer and smokes weed all day. But he is the only person I can connect with, because we are so similar personality-wise.... I have so many problems in my life, and know it is important to get away from him and get my life back together so I don't become like him when I get to be 46 years old....but I have such a powerful spiritual bond with him that I can't imagine life without him. He is not related to me, not part of my family, so it concerns me that I love him so much.....how can I move on with my life? Should I be friends with him, but keep my distance so I can get my life back together? Or should I completely move on from him and just stop talking to/hanging out with him forever? HELP????