Not all questions have answers. Sometimes things happen because they have to happen, without motives and sometimes with motives, but always with consequences. Without explanation, however much one may ask "Why did I give all of myself?" "Why did I try so hard for nothing?" "Worth the pain?" "Why? Why? Why?" And we don’t realize that the more we seek answers for those questions, the only thing we do is to frustrate ourselves by not finding them. It’s better to think that everything happens through something, without seeking explanation. But that your reward will be better than the pain they left you. But since we are human, we are masochists. So we would do it again.