I'm so sorry you're faced with this right now. Sometimes you HAVE to do this in order to keep peace and allow your other cats the stress-free home they deserve.

I sooo wanted to keep foster Aladdin this past Christmas. Even hubby wanted to. But it became apparent Aladdin was just like Monte and I gave him up to another family (where he apparently is doing the same thing there ) As much as I wanted to love that boy, I knew my cats didn't deseve to be terrorized.

Rehoming Monte isn't a crime. Especially after you've given it ample time to settle down, for him to grow and mature, etc. He deserves a home where he's happy and free to be himself. You deserve a home where you're not constantly going after one cat all the time and soothing the fear out of other cats. Your cats deserve a home where they don't have to keep a lookout for the terror coming down the hall.

I know you are very level headed and wouldn't just jump to this conclusion. I'm sure you've given much thought to this and are not making this decision easily. I wish you luck!