There has never been a merging of two lives where...

There has never been a merging of two lives where significant problems of daily living did not occur. One way or another, your relationship is going to be affected. The only question is how. There's a big difference between knowing and doing. It's not what happens between partners that determines the outcome of a relationship, it's how they handle what happens. If all you deal with in your relationship is problems, then you will have a problem relationship. If you want your pound of flesh with full acknowledgement that you're right, your future will be dim.