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...
user
What happened?
assistant
My boyfriend.  I knew he cheated on me but he said he wouldn't do it again. 
user
Well, you gave him the benefit of the doubt. It was his decision to cheat. 
assistant
True. Makes me feel so dumb though!
user
Now you have more information to base your next decision on. You live you learn.
assistant
Agreed!
user