blow jobs

So I tried this new way to give a blow Job... one hand playing with the balls, one going up and down and my mouth following that hand. My bf says he loves it and is the best feeling ever but when doing that he usually cums in 1 1/2 min- 4min. Is he just trying to get it over with or does it actually feel that good? Before it would take longer and our sex is around 5-15 min. He also says that he can't hold it in but I'm not sure if I believe him.