Question how to get your ex husband back comes to mind usually becomes critical only after breakup or separation which makes such task much harder but not impossible.
If you are still together then there is still chance you can avoid that emotionally hardest part of relationship and manage to keep this relationship going.
For that you first need to identify main reason why you have ended up with problems in your relationship.
List of possible reasons can be quite long and individual to characteristics of both partners but in most cases it is monotony of relationship which makes it less emotional and fun.
Especially if you don't have common interests then such monotony will come into play quite quickly after few years and mostly depends on previous history of your husband.
If you are his first love then chances are this relationship can last for much longer time even without common interests but in case your husband has liked variety and had several relationships before you then it will be much harder to sustain such relationship by leaving it to flow on itself.
Adding some emotional spice to your relationship can make it more fun and reduce chances of your husband seeking this fun elsewhere.
As example you can study what interests your husband has and try to share them even if you don't really like those.
Common things that men love are sports, cars, fishing and etc.
So if you join him in these and don't show that you don't like these but enjoy his company and possibly even find this interesting it will for sure make him bond to you closer as he will be sharing his own time with you and see that you enjoy his interests as well.
Remember that by coming along with him and sharing his interests you have much greater chance of making him more interested in your own interests as well.
Usually for men it's quite hard to show their emotions and enjoy romantic encounters unlike it's show in most movies in real life they don't behave like that.
But after you have given some of your time to share his interests they will more likely to be interested in finding more about your plans and possibly even fantasies you want to fulfill.
This way you will be finding more common ground and getting to know each other better.
There are quite a lot of ways to make your relationship less monotony and find ways how to get your ex husband back without breakup and make your lover enjoy this marriage and look into future expecting more fun and joyful time with you instead of someone else.