Sagittarius-sagittarius relationship?

The dream you mention here is very interesting. It could either be a reflection of your fears that his detached behavior means he's pulling away from you, or it could be a vision and he really IS pulling away (sorry!). It's said that Sagittarians can be hard to get to know, and as loose as your relationship's been it's possible that you may not know him as well as you think. The best thing I can tell you is to enjoy the time you have together, and if it's not meant to be then at some point one of you will have to tactfully break it off. The good here is that if worse comes to worse, you two have a good chance at remaining friends afterwards.