Name of movie : I'm trying to find information about a movie I saw some time back. I'd like to know the title or names of actors, etc.

A respectable mature married or divorced woman befriends a young male (approx. 18-20 years old) grocery employee in a small town.  I think he lives close to her also.  One night while she is either driving or walking outdoors she sees the young man crying and upset about something.  She stops and tries to comfort him by talking to him but he starts trying to have sex with her.  At first she gently resists.  But, he persists and because she feels sorry for him she reluctantly allows him to have sex with her on the ground.  Later the young man shows up unexpectedly at the woman's house  just as she drives up and he demands sex from her but she refuses because she has her young child with her.  He roughly takes her by the hand and pulls her into her house.  He forces her onto the kitchen table and forces her to have sex with him.  Later the woman agrees to have consensual sex with him and they become lovers but they want to keep their affair a secret.  So, they have to be careful where they choose to have sex. Once they made love in an abandoned railroad tunnel.