He is, and they plan a future life together, in happiness.

We might have lived together for ever in love and happiness.

He lived the last years of his life in happiness.

He lived on for many months in peace and happiness.

She was afraid to believe in so much happiness all at once.

That meant little to them, especially in their happiness at being back together.

We three spent the whole of Christmas week in perfect happiness.

In her own happiness she wanted to give joy to all the world.

For example, food, exercise and even religion often play a role in happiness.

Or perhaps I believed in happiness because of those experiences.