If he's a player, you can't believe ANYTHING he says. It's entirely possible that anytime he comes quicker than expected, he just tells whatever girl he's with that it's because of her.
Seriously though, why are you even thinking about what a player says to you? If he's sleeping with other girls, then you're just another easy lay. If you were special to him, he'd give up the other girls and ask you to be his girlfriend.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.