you can't expect much from neptunian relationshipsthey can be amazingly sweet, dreamy, out of this world and just "perfect"
but sooner or later they can phase out
the best strategy is to keep your head above the clouds at all times, and try to avoid expecting too much seriousness or a devoted commitment, and to enjoy it while it lasts
I'm currently involved in one too (composite sun/moon are opposite neptune, and in synastry his sun opposite my neptune, and his neptune conjunct my IC)
deep feelings of hurt can be present too (due to idealistic expectations from one another which the every day world may not allow), but like I said, it remains dreamy, enchanting and addictive nonetheless