Forces behind Love

the possibility of 2 people falling in love is like the probablity of 2 atoms coming close to each other over a given amount of time.

like the invisible electrostatic interactions holding atoms together, love binds and keeps people together.

But how do we remain near the other and yet not too close so that we dun end up colliding like the atoms do and separating to far distances?
And even if collision happens (coz its bound to occur some time), how long does it take for the 2 atoms/people to come together again? Soon or Forever?

Again it depends on that probablity of them coming close and the possibilty of them falling in love with each other again just as they once had.

What then is the ideal distance between couples/atoms so that they stay as that, having a balance of both attractive and repulsive forces?
in every relationship, that is the goal waiting to be achieved...some succeed in that, while others give up halfway as the collision proves to be too powerful that it separates them to the far ends, never to meet again.