movie name help.

The movie is set in england (I think)main character is a 40ish woman, who is a principal in a high school. She has 2 close female friends, one a gynecologist the other a prison rehabilitor. She meets a former student of hers and has an affair with him,and he asks her to marry him. but the friends are jealous of them and try to break them up by framing him with one of the girls.the couple have a huge fight, he walks out and gets hit by a truck and dies in the hospital. Next few scenes, she's super depressed(there's a song playing itsca super sad one) and she falls downand stays down. She finds she's pregnant and tries yp get married, but realizes she still loves him. In the end the 3 women are friends again.