Did i over react?

ok i love my boyfriend we've been together as in live in for two and half years. We were both given a set of keys for the apt and mail box. Some how his mail box key got lost like as we moved in to this place. I've had my keys the whole time. Well today he takes my mail box key off my keys and puts it on his. I didn't flip out but i said calmly asking what he was doing and why didn't he ask. He explains he needs to check the mail, i told him just borrow my keys then like the whole don't take the key off. He doesn't and says that he didn't want to borrow my keys he wants his but needs to check the mail. We take a shower to which it's still a conversation cuz he just basically doesn't get that i'm upset. i tell him he's not respecting my emotions. He goes on about i'm over reacting about the apartment mail key like as if it's not mine. I'm even more upset cuz i hear a tone in his voice like i'm being silly. He was washing his hair and said i didn't know you were so attached to a key. I left the room cause i was so mad. He after getting dressed he puts the key back on my ring i tell him i'll just put the key on the pool key ring since we only have one mail box key. We both apologized and i told him later he sounded like a jack *** about the attachment, he said he wasn't sure if i was messing with him till i left mad. We usually don't have this sort of arguments, usually barely have arguments to where i feel i need to leave due to me being upset. We are fine now but just asking. I feel as if it's my key i didn't lose mine and if it keeps getting swapped between key rings it will get lost, That's why i said to put it with the pool key That's alone and on a nob in the apt. I think maybe a little but he didn't ask i know we say what's mine is yours and what's your is mine but idk. Idk i don't get upset when he uses my phone or gets in my bag to get cig pack. Idk just my keys and my wallet i'm protective with idk why. Is this silly? Again we are fine we hugged and said sorry and all. Idk my feeling felt disreguard though

Just a question?

Can you make a copy of the key at a hardware store?
They are typically 1-2 dollars.

He needs to go to the apartment office and ask for a replacement mailbox key. It might cost him a buck or two. It's not about the key. Does he disrespect you in other ways? That's why you would have "over" reacted to this. Isn't he an adult? If he were living on his own, he would have gotten his key replaced without insulting anybody about how attached they were to their key. If he had been a little more attached to his own key, he wouldn't have had this problem to begin with, eh? (Okay, that last smart remark maybe why I live alone!) I'm glad you made up, maybe not a big deal if things are usually cool. I would have to have my own key for when I come home & pick up the mail. I MIGHT be a little suspicious about how he lost it.

Lol Hankster that made me laugh. Very true though i told him from the beginning of the lost key he had to go ask for another but it's been over 6 months i'll probably have to ask if the whole key becomes big. I was very questioning when it came up missing cuz like really a key fell off? Lol but he's been puzzled on how it came off like his keys are on clips but he's used it for a long time and no other- well known key- has fell off.
He doesn't usually disrespects or not see that i'm upset. Usually he's keen to that and isn't mean or a jack *** like this time. Idk it did start to get me to question but he called and apologied again. Idk he apologied even again today for last friday too which i got upset about him not being home at a regular time, and pretty sure he didn't say anything bout lateness. I'm a little off on trust but not due to his actions, so i could be carrying over from last friday idk. Sunday wasn't great either cuz i thought he was attacking me with "we see the world different we react different to things" lol i laugh now cause that was him being innocent with an observation but i seriously thought he was saying he was better than me. Idk hmmm now i'm starting to think more on this. I'll go ask for a key, yes we're adults in age but he's still 15 some times lol as i can be thank you guys i'm sorry i think this maybe me a little but still he should had asked and maybe next time he will with keys i can only hope cuz knowing me i'd bring this up.

I understand where you are coming from. It was disrepectful to just take the key of your ring without asking. It's not about the key itself. It' s about him respecting, you, your things, and your boundaries.

Exactly. He usually does idk where the air bubble came from today lol like it was out of his character to do such a thing. Maybe he really didn't see it as an issue?

It sounds like he does not see this as a big issue. He lost his 6 months ago and it is not important enough for him to replace it. He apparently does not place the same importance on it as you do.

I don't think you over-reacted at all.

thanks idk we chatted again cuz i'm insecure - i asked if i'd done anything wrong and he was confused with why i asked. I shared with him my thought patterns last friday about when i get upset which ranges from worry to destroying things and thoughts of leaving. I don't physically do it but i think it, i'd never shared these thoughts till last week and i must admit i am insecure about it- about sharing and yes thoughts of like he doesn't like me now.
Sigh long story short he said this we had never before talked about keys and me, unlike my wallet and me. If he knew he'd be more alert with asking.
I'm an odd ball though cuz yes space and things and boundaries but yet i don't care about him getting in my bag or using my phone and so on. I know it could be difficult to determine what i'll be possessive over. Sigh. :-P i'm glad we talked even if it was like 5 times about keys and stuff lol thank you guys for understanding. I don't feel as bad and confused either as i did when i posted the question.