Is AUTHOR wrong in the post ? POST : I came home from work and my dogs were running around the yard. He was at my house, he let himself in because we don't lock the door (we live in the middle of nowhere), he went into my bedroom and let my dogs out of their crates and into the yard. I live on a road and the dogs have to be watched closely if they aren't on leash. I do not trust this person to do this.

We went on vacation and he was given a key to check on the house in case of extreme weather or flooding. When we got back all the weed was gone and there was evidence that he and his family had stayed there while we were gone. They don't have the greatest living situation so I can see why they would want to say a while. However their living situation is not my fault. I lost my shit and while my boyfriend was upset, he thought I was overreacting.

I keep a pencil from my Mom's exchange student trip in the 60s in my art supplies. They are currently in open boxes in the living room. My Mom died when I was a kid and I just keep it there to remind me of her. Boyfriend and his friend were working on a construction project and I'm talking to them then I notice that the pencil is being used. He went into my boxes and got this pencil. It's not about the pencil. It's about my space being invaded. 

I've always lived alone and not had to worry about this.  Boyfriend thinks it's no big deal but I feel like nothing is sacred in my house and I wonder what else has been taken/done. 
I don't do well with expressing anger and just left the house without talking to anyone. My boyfriend has asked me to talk to the friend about it but I'm afraid I'm going to come off as a total asshole.

Do I deserve to be SO ANGRY? Or should I lighten up?