Are you ever free of breast cancer?

I had a single mastecomy (left) in March 2023 after 3 tumors found through mammogram.

3 years later, I'm taking Exemestane and doing all the exams I need to do (self exam, yearly MRI, yearly mastectomy).

Since the cancer was estrogen positive, I need to continue on Exemestane for 7 more years. I've read that estrogen positive breast cancer can return after that.

So are we never in remission?