Tell him and show him with action. Especially when are not called for. Everyone makes mistakes, don’t be ashamed of saying that you are sorry. On the other hand, don’t hold a grudge if he made a mistake. Try to communicate and make compromises that keep both of you happy. Show interest in his passion and encourage him in activities that he likes. At the same time, don’t force him to do things that he hates. Most importantly learn to have fun with each other, after all, hate is not the opposite of love, it’s boredom.