AITA for letting my boyfriend’s cat outside?

My boyfriend of a year owns his own place and has a cat, Libby. She’s 2 years old and has always gone outside. He is stopping that as he said she injured her paw quite badly and had scratches on her after another cat attacked her. He said a few of his neighbours have become concerned recently as their cats have also become injured. She was quite poorly and it cost him a lot in vet fees. He said that he gets it’s a change for Libby as she has been meowing at the door to be let out but that it’s for her health and safety and he said he’s planning on building some outside open air cage thing so she’s still outside but concealed in it.

I was there the other night and Libby was meowing at the back door. I said that it wouldn’t hurt to let her out as she was very loud. He says he just ignores her for 10 minutes and she’s fine and told me not to let her out. She seemed really insistent so I let her out. Bf was none the wiser but after a while he noticed how quiet his house was and started to look for Libby as she normally cuddles him after not being let out. He started freaking out when he couldn’t find her and I told her I let her out. He got really angry and asked ‘why the fuck would you do that when I told you I don’t want MY cat outside?’ He started saying I’m rude, insensitive and horrible for what I did. Libby came back after like an hour. She was fine.

My bf kicked me out and has been cold to me since. He says that he doesn’t trust me in his house anymore or near his cat. She’s a really sweet girl and I love her and I don’t think I did anything wrong. I think he’s being really paranoid just cos she got hurt once. I’m trying to make him see my POV that he’s being too overprotective and he says I’m an AH and that he needs some space from me.