RSVP I'm sorry to see you joining us here but it's great to be asking questions both here and of your surgeon.
In my experience, my GP had mentioned both but she wasn't sure which I would need. At my first meeting with my surgeon he talked about lumpectomy and when I asked about a mastectomy he said that was my choice however he provided reasoning around lumpectomy being enough in my case - the placement, type, size and grade of my tumour, recovery, etc. I felt comfortable with trusting his experience and approach.
A year later I have a neat line scar on my affected breast but otherwise it looks exactly like it used to. There is the mental load of wondering what happens over the coming years however chats with my oncologist, surgeon, GP and a psychologist specialising in cancer have helped.
My surgeon has repeatedly said to me that I will be closely monitored for a long time - not what I expected in life but I'll take it as a big warm cuddle of care :)