history: I had a boyfriend who cheated on me. He promised not to do it again, but then he did.  I can't believe I was so stupid to believe this... What happened? My boyfriend.  I knew he cheated on me but he said he wouldn't do it again. 
current: Well, you gave him the benefit of the doubt. It was his decision to cheat. 
next: True. Makes me feel so dumb though!