Sentence 1: I was away at college, and had a long distance relationship. 
 Sentence 3: One day, I was talking to his father on the phone 
 Sentence 4:  His father told me that he was cheating on me badly 
 Sentence 5:  I broke up with him and never looked back 
 Option 1: I knew my girlfriend had become distant, but I trusted her. 
 Option 2: I knew my boyfriend had become distant, but I trusted him.