My fiance is really mean/careless towards me lately.. what can I do?

Do not marry this man unless you are 100% sure that he is the man you want to be with. If he is rebelling against the wedding then there is a reason. If you love him and want to marry him, then just hold off the wedding. Give it more time. If you love him now, you can still love and marry him later. It is better to postpone the wedding then deal with a divorce b/c you rushed into it. Sorry for your loss, but I agree, you need to take time to grieve. A wedding will not solve anything, only cause more stress.