You married to your husband not to his parents.. he has all the right to move out, who is asking you to cut all the ties between your inlaws.. have them come over, cook for them, go out shopping. etc.. etc.. and if you still wont budge, then i'd be very annoying as well if i were your husband.
^ Agree.
Sonia, you can try your best to convince your husband to continue living with his family. You can even tell him to mention that "moving out" was HIS idea and not yours since you're worried that his family might assume that it was all your doing.
You can try to get him to delay moving out until after his sister's wedding, especially if it will be taking place in the very near future.
BUT as Mc12IT has mentioned, you have to ask yourself who are you married to? Are you married to your husband? Or to his family? Let's assume that your husband stays with his family but he feels miserable, wouldn't that eventually take a toll on your marriage?
I'm not trying to burst your bubble here. But in the event that things don't go the way you want, I'm trying to get you to consider your husband's point-of-view. Moving out doesn't necessarily mean that he doesn't love his family or that he's not family oriented. There are some people who live away from their family but have so much love for them. And there are other people who live under the SAME ROOF as their family and treat them like dirt. Maybe your husband feels that it would be less stressful for him financially if you both lived separately. The more people you live with, the greater the expenses. Maybe your husband is thinking about this issue in the long-term. Maybe he feels that things can have the potential to get complicated (drama, future arguments, jealousies) in a joint-family system. Maybe he thinks that once you both have children, things will become more complicated or crowded. You can request him to find a home that is closer to your in-laws; that can be a compromise. To alleviate your loneliness, you can visit your in-laws often. Perhaps this experience will provide you with a new found confidence and independence as mentioned above.
Talk to your husband about his reasons for moving. And in a situation, where both parties hold such opposite views, realize that one person is going to lose. And to make the best of this situation, both parties should compromise to meet at least some of their needs or desires.