It should bear fruit again next year so keep it.

Once the runner has rooted in the pot – cut it free from the parent plant – the parent plants are normally kept for 3 years before you discard them and plant the new plants that you have taken as runners –

As a rule of thumb you cut all runners from the main plants until its 3rd year of fruiting- then in its 3rd year take runners and plant in pots - once the runners have rooted cut from the main plant– this is your new stock– and discard the old plant - remembering to turn the soil dress and feed for the new season - I choose the strongest plants and the best bearers of fruit to take my runners off – the rest I discard. Then repeat the task every 3rd year