It is true that Relationships tend to be complicated, but it is much more worthy to work through those complications instead of "letting the whole thing be".
In any case, complicated relationships fit to complicated people. You can not blame neither one of them for being what and who they are.
Complication in a relationship is not aways negative. It could also mean Steps to a Common Path. When two totally different people set their differences aside to make things work, it is not called "complication". It is called "effort".
Letting go, or letting be, is the easiest thing to do. If you want to have a relationship to remember, choose a challenging one. Leave the easy things to others.
A relationship can never be too complicated. Consider it as the Gordian Knot. If it took one brain to solve it, imagine what two brains could do.