Is it possible that two cats will never get along?

I have a 9 year old Siamese cat and I think he gets lonely during the day and want to get another cat to keep him company. I am worried that even if I follow all necessary steps they won’t get along. I live in a studio apartment (the adopted cat would stay in the bathroom during introduction) so I couldn’t keep... show more I have a 9 year old Siamese cat and I think he gets lonely during the day and want to get another cat to keep him company. I am worried that even if I follow all necessary steps they won’t get along. I live in a studio apartment (the adopted cat would stay in the bathroom during introduction) so I couldn’t keep them seperate forever and would have to return the adopted cat to the shelter which would break my heart.

Any advice would be helpful!
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