Your "beloved" seems like a charming person, dependent to some extent on you, who is keeping his options open. So can you do the same? I don't mean online dating, but starting to spend quality time with the odd friend or family member, or take opportunities to make a couple of new friends, male or female in your area, so that you're not as dependent on him for company and eventually you might not feel as dependent on him emotionally. Then, with a clearer head, you can work out whether you actually do want to marry him next year., bearing in mind you already know he's not to be trusted. From everything you've said, I think you deserve better.