Due to the diversity of humans on earth, you have a lot of ways with which people deal with disappointments. With some people, they give up on that aspect and they never venture again. They block that aspect and leave without learning anything. Others use the pain of disappointment to learn a lesson which will be useful to them in their future. While others let this disappointment kill them slowly, on the other hand others insist until it becomes a blessing. That is the positive mental attitude with which we need to handle disappointments turning them into stepping stones for future stumbling blocks.