Yes they are going through puberty and their hormones are kicking in. You will need to separate the male and female, not only for their safety because they can have terrible fights once puberty hits, but also so that the female doesn’t get pregnant which he is probably trying to accomplish. Rabbits can be fertile from as early as 10-12 weeks of age and bucks after being neutered can still remain fertile for up to six weeks after their operation. In addition, your female may also get very territorial towards your male and yourselves, do you intend on having her spayed as well? I would highly recommend it, uterine cancer is common in females.
After he is neutered, his behaviour may get worse for a while, this is known as the post-neuter craze. It doesn’t always happen, but it’s something to be aware of if it does. But after 6 weeks he should have calmed down well. Some of his behaviour may remain, but far reduced from the way it was. Once you have your female spayed as well, 6 weeks after she is done you start bonding them properly in neutral territory. Separating them now is very important, because avoiding fights will make it easier to bond them down the track. 