Family of my own, maybe

So I've longed for this for a long time now and for it to be almost perfect. He's my best friend and I could never ask for anything better, but things are getting bumpy. We are trying to plan on moving out of out hometown because of his friends influences on him and the current issues in our town dealing with drugs and several problems. He's been drinking more and he's been getting sick each time he drinks, I'm hoping he's not on anything and I'm hoping he hasn't drank himself away already. He wants to party which I understand since he's in his early 20s but I'm not that kind of person, I want more of a family soon, I already have fertility problems as it is and I feel like our new family is either going to make us or break us.  What do I do ?