Collecting Social Security against my ex-spouse

I began drawing SS against my  ex-spouse's Social Security when I turned 66 (I was born in 1952). I was told by the SS office that this would not impact the amount that he would collect, nor would it impact the amount I'm entitled to collect when I begin collecting at age 70. Is that correct?

 

After I begin drawing against my own SS account, can I continue to draw a percentage against his or does that cease?