When your boyfriend's father cheated on his mother?

When my husband clams up and doesn't feel like talking I just lay with him with my arms around him and tell him that when he is ready to talk I am here to listen. That's pretty much all you can do, if you try to force him to talk it will just make him clam up even more..just give him time to sort out things in his own mind then he will be willing to discuss it.. just let him know you are there to support him and listen when he feels the need to discuss it..