If you are in a committed relationship with him, you may just want to open that up a little. You don't have to break up with him entirely. What if you tell him that you would like to consider yourselves "dating" but that you would like to be free to see other people. Not that you're going right out now and looking for someone else. But do you really want to commit yourself heart and soul to someone set in their ways, knowing you may both want different things for the future? Personally, I would not. Of course, he may not agree to taking your relationship down one step, and maybe that would end things altogether. But if it does, I think that means it's not meant to be.