On the axis of time everything changes in form, intensity or concentration due to numerous external factors which are either new or have also been transformed on the axis of time. One discussion which we often have amongst our group of friends is the metamorphism our friendship has undergone due to some of us having tied the nuptial knot. When none of us were married, most of the things were easy going. All the misunderstandings due to what-so-ever reason between two friends would fade away with time. While cracking a joke at someone else's expense, one need not think of it twice. Nobody took the thoughts back to brood over for long and hence differences were little.
But fact of the matter is that change is something which is inevitable. One will get married and there will be the extra factor in form of spouse which will come in life and amongst friends. No body wants to loose friends, neither you nor your spouse. Now when extra constraints are there due to changes in life post marriage, extra effort is required to thrive at the same level amongst friends. Very minimal misunderstandings which if involves your spouse, can grow up to become serious differences because it's your duty to safeguard the dignity of someone who has come into your life leaving everything behind. Then ego creeps up and prevents us from making the move waiting for the other person to call upon. And this is the classic way of distancing. Time cements the distance in such a manner that it becomes very difficult to melt it.
So, what's the remedy here? We should be ready to accept the change. One thing which I believe we should do is restrain and maintain healthy distance.
It is better in my view to have a thriving friendship than to let it go to a level where one does not see eye to eye. Because when we will grow old and think about the mistakes made in life, few such mistakes will look really silly to have been committed. But we will not be able to change anything as on the axis of time everything changes in form, intensity or concentration.