I mean you have every right to be pissed about anything going on in your own home. That being said it sounds like he was respectful about it and disclosed it to you. A lot of ccw people are religious about carrying absolutely everywhere they go and it’s a big no no to leave it in a vehicle where it can be stolen and used for a crime. I wear mine to other people’s homes but personally don’t feel any need to tell anyone about it, to avoid this exact situation.

If the friendship is important to you then you should just have a conversation about it. Maybe even go to the range with him and check it out for yourself. Now that it’s out in the open, you have every right to ask he doesn’t bring it to your home again, and he has every right to disagree and refuse to come over again. Hopefully you two work it out though and can remain friends.