Lump found in right breast

Deannie, obviously it's impossible to guess what's going on from a brief description, even if we were doctors, which we're not.  But my first thought is that if you were carefully screened 2 years ago, it's questionable whether "a good sized lump" would appear in that time frame.  For most of us, breast cancer takes many years to grow to the point where it's detectable either with imaging or by self exam.  Also, the fact that you had 4 prior benign lesions may also point to this one being benign.  But definitely get it checked out ASAP. 

And as far as your fiance goes, I understand your fear, but if he's the kind of man worth committing the rest of your life to, I would hope that he loves you enough not to run away from a health problem (hopefully just a scare).  Would you, if positions were reversed?      Deanna