Sentence 1: Tammy knew that her husband was running around on her. 
 Sentence 3: So she had her friend watch her husband when he was out 
 Sentence 4:  The friend took pictures and video of him meeting different women 
 Sentence 5:  Tammy took the evidence to her lawyer to begin a divorce 
 Option 1: She already had proof of his infidelity so a lawyer could help her. 
 Option 2: She needed proof of his infidelity or else a lawyer would never help.