Tom freaks out, he never had anyone to teach him how it works. So the first thing that comes to mind was to punish how made bleed. But you explained what happens every month, and he starts to get it.

He buys you chocolate, pillows, and cuddles. Lots of cuddles. He isn't afraid to buy you tampons/pads. He makes sure no one makes you upset.

But he is still terrified that you'll be mad at him when he says something sensitive.