This is a combination where the number set is compatible in some areas and incompatible in others, therefore, this relationship requires a bit of extra effort. Because of the 3 and the 8 having very different views as to what is important in life, unless they learn to respect each other's needs and expectations, the relationship will not last long. Despite this, because you complement each other well, more often than not, you can get along very well and can be quite compatible.