My boyfriend bought his ex underwear?

So, we've been dating 6 months and it's the first Christmas they'll have been living 'separate'. He tells me him and his ex have bought each other stockings to open on the day (as was the norm in their relationship), then says one gift he bought her is underpants as 'thats what she asked for'. His defence is that they're cheap underwear and he wanted to keep the 'normality' of the gifting. My argument is that his ex has a new partner who can buy that stuff. He also suggested that this Christmas we don't buy gifts for one another... but he can buy his ex underwear?
To me its about principles and standards - would he be comfortable with me buying an ex underwear. Short answer - nope.
What do you think? I need serious direction here.
My boyfriend bought his ex underwear?
Add Opinion