.

I am on level 1990, the highest level. And the infinite symbol is there. I have passed anothee 250-300 level after that. So.. Yes.. It is never ending!

i meant "stop playing when you get bored or feel hopeless"

Just keep trying! Ive reached level 1203 now. Need some days to complete one level while collecting diamonds from the daily gift to buy extra steps. Some time they are being nice by giving us bonus (flower,button and rainbow boost!) from nowhere, and we can complete the level effortlessly :))
Just stop paying when you get bored, and have try in another time!