It's hard to quit on gambling especially if you are having fun mate!
But then if you really want to do so then better discipline yourself,avoid playing and put yourself into something different that will make you happy..
By trying to overcome by his own is very hard. If it is possible, he would have done it himself. What he also need is the support of loves one. His friends and family should help him to divert his attention and let him engage in other meaningful activities.