Trying to do proper introductions for cats since moving in together but SO's cat sometimes gets into newcomers' room by bolting in behind me and attacks my 2 cats. He's VERY aggressive and will not calm down. We are desperate for help

I have two neutered male cats who are 9 years old and my SO has 2 cats who are just over 1 year.

My cats are the newcomers and my SO's cats are the resident cats.

His one cat--a neutered male Ron--is a wonderful friendly cat to us and his littermate. However, he sits by the bedroom door where my 2 cats are kept and hisses. Anytime I open the door he either hisses or, as of the last week, will lunge and try to get into my room to attack them. I try to slip through the smallest opening I can in the door but sometimes he gets in. So far it's resulted in him attacking my one cat who is now being treated for an abscess from an infected bite wound, and just now he bit my foot enough to draw blood while I tried to slip through the door. This is week 7 of me moving in and trying to do introductions.

We have done introductions for the other 3 cats (my 2 males and my SO's 1 female) and they are all fine. His cat Ron will not calm down in his aggression. He specifically goes after my cat Pumpkin when given the opportunity. He and my cats have never been in the same room together save the 2 times he has gotten by me to attack them. My poor 2 males are very stressed, will sometimes spray if they hear Ron scratching at the door, and are confined to my bedroom all day. I feel so badly for them.

I know it's not Ron's fault because he's just being a cat, but I'm at my wit's end. We moved in together because that's where our relationship is at and also for financial reasons now with COVID

Things we have tried:

• having my cats in the room with the door closed with no attempt at introduction steps to let them acclimate
• we have a Feliway Classic and a Feliway Friends insert
• Feeding them at the same time but separated by the door
  • we were stuck on this step but after my SO's cat Ron attacked Pumpkin and Pumpkin developed an abscess, we are just keeping them separate and not pushing for any stage of introductions

I can't even let my 2 cats out to roam in the rest of the apartment because Pumpkin is so tense that he spray when let out of the room. Please help us :(

submitted by /u/dinglebong12
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from Pets https://www.reddit.com/r/Pets/comments/i0wxvo/trying_to_do_proper_introductions_for_cats_since/