I slept with my boyfriends brother (when we was seperated) and told him please help?

hiya, tell him that he as cheated on you with other girls,and you did not cheat on him,because you were broken up at the time.try telling him,that you were so upset about losing him,that when his brother ask you out,all you wanted was your ex,and his brother was so like you that it just happened,but relies after,that he can't take your place.see what he says to that.it might work.x