The life expectancy of a strawberry plant is usually only a few years. The plant knowing this is aware that it most have offspring. I’m not suggesting that plants are self aware, but this mechanism is built into its genetic code. That’s the way the plant works.
Container grown plants are unable to propagate themselves so they rely on us to help them.
Strawberries replicate by shoots, also called runners. It sends out these shoots looking for soil to plant itself. Once the runner takes root, it severs its ties to the parent plant. Leaving a separate independent plant.
To propagate the plant, just lay the runner on top of soil in another contain (or on the ground). Within a couple of weeks it should have taken root. You can then cut the runner away from the parent plant. You now have a new plant.