Start a new hobby
The best thing that one can ever do whenever they're face with relationship problems is to develop a new hobby or help themselves deviate their passion in another direction. This can prove to be a very constructive way to spend time, especially when one finds it hard to get rid of the thoughts regarding their ex. Whether it maybe arts, sports or cooking, a new hobby is always a beneficial usage of time.
For a man who recently got divorced by a person, whom he has been living with for such a long time is a hard thing to go through. He needs someone to listen to his thoughts, problems and memories that he had of his past times. Letting it out could prove to be a relief for him, and help him get rid of the stress that his mind was facing. Give him time, show you understand and are willing to offer your help if needed.
Help them get over their ex
That's one of the main things to be done, as it's hard for anyone to get over their ex. You need to help them realize that their marriage is now over and it's about time that they start to look on the horizon and think about what the future holds for them. Divorce can happen to anyone, but despite that being a very hard thing to get over, everyone must move on if that does happen. Moreover, don't bring about stuff that may remind of his ex, this would have a very negative effect on his thoughts, and may cause him to go deeper in depression.
Meet new people
A person can't move on or get over their divorce if they don't start meeting new people. It's essential that you should help the man in meeting new people, just to get over their ex. Although, it's not likely that the man would seek to start a new relationship, yet the thought of hanging around a new person, getting to know them can induce a sense of positivity and make him realize that the divorce is not the end of the world.
Divorce can affect moods, mostly in a negative way, which leads to the person thinking pessimistically. This can have a derogatory affect on not only the man, but also on his relationships, ambitions and his work output. Therefore, it's essential that you help him see the bright side of the story. Have a look on the positives, that what opportunity does the end of this marriage begins.