<human>: Can you condense the text into a few key points?

My bf and I have been dating for about 5 years, living together for almost 3. We've gone through a lot together: we've moved cross-country twice for each other's jobs/school, he's suffered through years of depression and alcoholism (now under control), plus normal ups and downs and HEY! We're still together. And mostly pretty darn happy. 

My problem is.. we never talk seriously about the FUTURE. We haven't since we first started dating (and back then it was a very general, "do you want to get married someday?"). I mean, we've talked about buying a house together someday and how much we need to start saving up, we've even talked about having kids together, but we've never talked seriously about marriage (which I would like to come before both having kids and buying a home). And I feel like we're at the point where it's really weird that it still hasn't gotten brought up by either of us. We both have friends who have gotten married, his older siblings are happily married, both of our parents are happily married.. so there's really no obvious reason why this topic is so untouched.

Honestly, at this point I'm really afraid that if I bring it up I'll hear something I DON'T want to hear: "Uh, I don't know" or "Maybe" or "I haven't really thought about it" or "We'll see" or "Things are going so well right now, I don't want them to change!". I guess I thought it would have naturally come up at some point, but it just.. hasn't. And now I'm worried that I've spent 5 years with someone who doesn't see a future with me... and I was too dumb to find out sooner.  

How can I bring up this topic at THIS point in our relationship? Should I read more into the fact that we've never talked about it?
<bot>: My long-term bf and I have never had a serious marriage-talk. And now I'm afraid to hear what he has to say about it!