Has your marriage collapsed to a point where you think there is little or no hope to sort things out? Are you still committed and prepared to do anything to get back together? Are you looking to get husband back before it really is too late!? Good! This is you showing a great sign of commitment and you can use this to your advantage and hopefully get your husband back for good!
Now listen; I really do know the feeling of break ups. Anyone that hasn't been in the middle of a major break up simply will not know exactly how you feel. For this reason I certainly wouldn't take any advice from them. Now I know your down and upset, but you need to focus if you really want your relationship to work.
Of course, there are a few things you can do to ensure that they don't let go. The easiest and most simple way, is ensuring you respect their decision. A lot of thought goes into a break up, so begging on one knee is not going to suddenly change their mind. In fact, this will establish that they have made the right decision. Nobody likes someone that is desperate, so this certainly isn't the way to get them back.
So we have established that desperation isn't really the way to get husband back. Instead, give them some space, this will give them time to think about you and your relationship. It will allow them to view life without you. If you are always contacting and annoying them you are allowing them to get over you without any pressure.