You? Stupid? Nope. These things happen when a couple feels they're compatible 4 eachother only in the end they're not. It's nothing to feel ashamed about because how else are 2 people going to find out whether/ not they're compatible as a couple? Being in a relarionship is simply putting that compatibility to the test. If it works out that's wonderful. If it doesn't there are plenty of other new people to discover a wonderful relationship with. Even if you never find that partner, the single life is always nice too because with a compatible relarionship you do have to make compromise so both are equally satisfied.