What do you do: Situation 2

You know two people. You know both of them very well but they dont know each other.

They have to interact and one acts in a particular way. To the other, it looks odd and unreasonable. To you, it sounds perfectly expected, and in a way unavoidable, since you know the person very well and have gone through many things with the person.

To the second person, everything is new and finds reactions odd. You understand that too, but to resolve this, you have to explain to the person the reasons behind this, which are things that you have always wanted to run away from. But you are bound to explain it afresh now, and you feel uncomfortable.

Both people are indispensible to you and you cant let the discomfort continue between them.

You know both sides and you are responsible. Both of them target you for the problems now since you havent been able to handle them well.

What do you do.