Those ideals regarding romance and love that you've both harbored up till now will be exposed to the light during this two-to-three-year transit, and will likely be destroyed -- a painful, disillusioning process for you both. It's as if the shutters will fall from your eyes and your hearts, exposing you to the truth of your relationship, and you may not like what you see. It certainly pales in comparison to your pretty dreams, the hopes and illusions you've been operating under because it's so much easier than accepting things for what they are.
The process of acceptance can be a messy one, though, and it may not happen very quickly. Jealousy and possessiveness could become a big issue between you as a couple, as you each try too hard to hang on to something that you sense is changing, and perhaps ending. But try to remember that clinging tighter will only make those changes more painful and difficult; it won't keep your sweetie around any longer or make your connection any more true or loving. The opposite, in fact, will be the result. So deal with each other as straightforwardly as you can. Talk about your feelings instead of acting on them impulsively.