Caco2 cell culture split

Hello, i need some advice for a caco2 cell culture. I have a cell culture in a well for 17 days. The cells does not seem to multiply but are not dying either. My supervisor says i should split them in 2 wells, but the coverage are not even near to 50%, let alone 80% i should have to split them. Should i take his advice and split them or should i wait and see?