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 Conor Grennan  have very steady and comfortable life before left to his home country, he is single and dont need to worry about money. Conor Gernnan want to change his life which he think was very bored, he want to travel round the world and do something that can make his life different and meaningful. Help orphans in Nepal that was very good chance and excuse, and this excuse can let him get support from his family and friends, also will not limit his travel plan.

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 After Conor Grennan get along with these Nepal orphans, he felt very difficult to leave them. These orphans changed his concept, let him felt he is father of them. He has sense of responsibility for these orphans, they let him know what is really meaning of family. These orphans are become very important part in his life, but he still dont want to abandon his travel plan, so he promised that he will come back to Nepal after one year.

Compare first and later reasons.
  At first time Conor Grennan is only want to run away and break his bored life. So, help orphans just a good excuse to help him get support and persuade himself to leave, his real goal still was travel round the world to find some new and exciting things. But his later time to leave Nepal, he was felt responsibility, these orphans need hime and he also care about them. He felt they are very important to him and dont want to left them. So Conor Grennan has two different feel between first and later times.