I wouldn't say if you don't repeat Ada you are in big trouble or anything, but if you never tried her before there is definitely some loss. Everytime a girl leaves town, there's a chance they will be back after 3 month for more, there's also chance that shes gone forever. Granted there will be new girls in town to indulge us, but so many of these encounter is once in a lifetime. I mean, you might not like a foreign dish, but atleast you tried it to tell people you like it or not.
For me personally, I have so many sweet memories that I accumulate over the past decades, with girls I no longer know where they went. I still smile when the best one flashes back.
an Honest recommend, give Ada a shot before shes gone. She might come back, she might not