When and how does one have The Talk? What would you bring up? Anything you would keep back?

I'm early thirties (he in his early forties) and am at the three month mark with this relationship. He travels a lot we don't get to see each other often. When he's away I have difficulty handling where we're going. I'm happy with how we are right now, and, in a perfect world, would like to continue over the next few months/year to living together/marriage/kids. Knowing he's on the same page will help with my mindset. I want him to continue with his life/freedom, but want to know he's committed to me.