boyfriend buying girl secret santa

my boyfriend got picked to buy a girl in his class a gift for secret Santa, which is fine. and there's a possibility he might get another girl in another secret Santa he is doing. I know he wouldn't do anything flirty with these girls and it's simply just a Christmas thing for fun. so I'm not mad. but the idea of him buying another girl a gift (fuzzy socks and candles which he mentioned) (which are things I love) bothers me. it makes me feel uneasy inside and I don't wanna be crazy about it. how would you guys feel? how do I overcome the bothersome?