It sounds to me like he is having a burst of hormones, and trying to force himself on the pullets. It's really terrible to watch, I know, but it is normal. It also sounds like he is good with humans, so I wouldn't give up on him just yet.
If there is any way that you can pen him separately for a while, until the girls start laying, that's probably your best bet.
But, don't expect that things will just be clucky-happy when you let him back in with the ladies. Sometimes a rooster has to forcibly dominate the hens before they will accept him as their leader and squat for him.
That's what happened at my house with my rooster. There were some serious fights, and it was completely traumatic for me! But things did settle down, and the hens did accept him.
Bottom line, most young roos are a pain in the butt! Hopefully yours will grow out of that stage and make a wonderful flock protector and chick daddy for you.
Good luck with your wayward Romeo.