I am hoping IABU, I met my bf just before christmas, got together "properly" end of January, We were just chatting on saturday about friends etc, and he happened to mention that he used to date his female best friend of his (who I know about) He said they dated each other for 3-4 months about 3 years ago. Please tell me I am being totally unreasonable to be bothered by this? Why am I so bothered?