*shares my box of kleenex*
Please don't beat yourself up. You're doing what's right, and it comes from the love you have for your babies, and all the other kitties that cross your path. I know it's hard, but it's not your fault. Some kitties just want be the one and only, and Oliver turned out to be one of those, it's not your fault. You did your best, and we all know that you're the best kitty mommie, because you do whatever it takes to make sure they are all happy.

Don't feel bad about yelling at him , it's not your fault. You did your best, and I know he appreciates you trying, even if he's stubborn about a multiple cat household.

{{{{{{{{hugs}}}}}}}} *goes and gets another box of kleenex, because i'm having such a bad time right now, i'm bawling with you about oliver even though i haven't met him*

Just remember we're here for ya, and that you're doing whats best for everyone involved.