My boyfriend has been angry with me for sending people caring expression packs. I don't think I'm wrong, but I don't know how to say it.

In fact, judging from your short messages and your actions, your actions are not wrong. This is purely because your boyfriend is jealous. This jealousy is because he cares about you, so you should look on the bright side. You should communicate well and ask questions to solve them, or something will happen in the future. Good luck ~ but I think your boyfriend should be very exclusive. You are not allowed to send that expression pack to other men, but you must like it if you send it to him often.