Get your isolation pen or crate ready.
You may never have to use it.
But when he really gets going in the next month or so, it can turn ugly fast.
I'm guessing you are brand new to chickens and have never seen a male bird at it's worst.
It's when Romance meets Reality.
At 3mo he hasn't even hit his full hormonal load yet, you may become much less fond of him when he really starts terrorizing, and possibly injuring, the girls.
If you really want to keep him, I'd get a separate enclosure ready for him now.