It is beautiful to be alone, it is also beautiful to to be in love, to be with people. And they are complementary, not contradictory.

Two people in love, alone, isolated from the world, that's very beautiful. But what would they nourish their intimate talk with? However contemptible the world may be, they still need it to be able to talk together.'
'They could be silent.'
'Like those two, at the next table?' Jean Marc laughed. 'Oh, no, no love can survive muteness.

Those who are comfortable being alone can often love deeply and purely, because they are not sharing to receive, but simply giving.

That summer we had been absolutely alone, together, even when people were around, the only inhabitants of the kind of floating island or magic carpet which being in love is.

Lovers alone wear sunlight.

That’s love: Two lonely persons keep each other safe and touch each other and talk to each other.

The reveries of two solitary souls prepare the sweetness of loving.

To love makes one solitary.

When a love-relationship is at its height there is no room left for any interest in the environment; a pair of lovers are sufficient to themselves

Paradoxically, the ability to be alone is the condition for the ability to love.

and the two of them loved each other for a long time in silence without making love again.

...love is only a kind of festival of solitude

La solitude est une belle chose; mais il faut quelqu'un pour vous dire que la solitude est une belle chose.

Love consists of this: two solitudes that meet, protect and greet each other.