11 years down the train. ..

So I been with my boyfriend for 11 years I was 14 when we got together I'm now 25. But today some girl called my house saying she was looking for my so called boyfriend so I started talking to her she goes and tells me she his fiance and there been talking for almost 6months. And even talked about having kids. Wow how could I beeen that stupid to not notice he was cheating on me.... he never changed his attitude or nothing smfh.