No, unfortunately it doesn't mean that. Metastatic cancer is treatable, but incurable. It's excellent news that the cancer has responded so well to chemo, and with luck the chemo can successfully fight the cancer for some time. Cancer cells are constantly mutating in your body, though, and at some point it will become resistant to your current treatment and start growing again. When that happens, your oncologist will switch you to a different treatment and it all starts again. There are quite a few different treatments available, and new ones are being developed constantly. Your cancer can never be cured, but treatment should mean that you have a good many years of life to enjoy ahead of you.
Best wishes,
Chris