I agree with this post, but based on some of Rosebud's posts, I'm not sure this man is really the man for her. Sorry. by Shh!
I haven't read all posts by Rosebud, so you may know some things i don't. The guy doesn't strike me as the best man in the world, but their situation is serious and I think therefore it should be mirrored by the status of their relationship. I think it's too easy for a guy to weasel out of a relationship with an unconfirmed status, being married entails responsibillity and devotion to your partner (Does not necesseraly happen in all the cases, but points bluntly into that direction).
I think it's too early to say whether or not this guy is right or worng for her (Especially given the situation and the length of their relationship). I have seen much more incompatible people happily married for decades. What I haven't seen a lot of though, is a kid going to school with parents who are still in a bf/gf relationship (I know the kid is still 2 years old, but you can see where I'm going with that).
I believe two married, natural parents create the best living/learning environment for the child. But maybe i'm just too old fashioned, something I find as odd because I'm still young :)