He’s your only boy right? Does he show any other behavior issues? I’ve forgotten exactly how many hens you have all together
He might settle down nicely with time, or he might not... it’s really hard to say. Is Goosie laying yet? And if so is she a new layer? my very new layers and girls that weren’t laying yet we’re the ones the most freaked out by Mr Marans attentions, then he learned to go to the more accepting ladies.
It really takes them all a while to get the whole hang of the “mating” bit down, and for the girls to figure out it’s his affections and not an actual attack, even if they are older, if they haven’t had a rooster before. When I put Chickie Hawk in with the older hens I took from the farm everyone freaked out for several days, and it was a few weeks before they were all “ok” with his affections.
If they have space to escape him I would give it a little bit before you jump to separate him, unless he’s doing real damage. He will need to practice his courtship and techniques to get the hang of it... it’s a learning curve, and taking him away from the ladies could have a negative impact on his attitude (I think this was a contributing factor to my issues with Chickie Hawk)
I’ve noticed that the young male urges seem most prominent first thing in the morning, then things settle down. And remember chicken mating can look very violent, especially with a young cockerel that hasn’t a clue what goes where, and how to get the ladies to like him. 14 weeks is young, I would give them all some time but keep a close eye on things for problems like bare necks, cuts on their backs, or him getting too roughly schooled by the older/bigger girls for his behaviors. When I added the farm girls into Chickie Hawks pen I had to separate him for his own protection, the 1/2 his size little hens where fit to kill him from the moment he tried to mount one of them. So things can be deceiving.