Single or double mastectomy

I chose both breast to be removed and had reconstruction. It was my choice but suggested by my surgeon. I had dense breast tissue and had a clear mammogrsm only 5 weeks before i found a lump. My sister and niece had breadt cancer. My Aunts on my father side had either fied of ovarian o breast cancer...the last one died following breat, ovarian then another breast cancer. In my mind was always the thought if she'd had both she might still be alive. Whilst I have no gene like my Aunts, they believe my sister myself and niece probably have a yet undetected gene. 

So yes...removing the other breast does not reduce the risk of metastases, just the risk of a new primary breast cancer forming in the other breast.. I've miss my breasts but have never regretted the decision.