You made dua and you tied your camel whether it was for marriage, job or anything that you wanted and things didn't work out for you. When this happens don't lose hope. This needs more patience. Whatever you wanted perhaps was not good for you and this is a mercy from Allah most of us don't comprehend. Allah knows what's truly best for you. If things don't go your way say Alhamdulillah and be content with the qadr of Allah. Keep making Du'a and have sabr and know that Allah promised us that He will accept our Du'a soon or later and Allah never breaks His promises. Don't worry about When! It will happen when Allah wills it to be. We don't have any power to delay a matter or to make it happen early. Everything happens perfectly on Allah's time. So, relax and don't fret. Patiently wait for the answer. Just trust Allah wholeheartedly. He will take care of everything.