Trouble in Kitty Land

This is Munchkin.  She is a former feral we adopted about five years ago, and she has always been our sweetest cat, affectionate and cooperative, never causing any trouble at all.

This is Buddy, one of four feral kittens that came to us last December.  We fostered them until they could all find other homes… except Buddy.  Buddy was very shy and ran from people.  He would hide under furniture and refuse to come out.

Now that he is older his personality has changed 100%.

Now he is very affectionate with us.  When one of us walks into a room he runs to us to be petted or picked up.  When we walk around he follows us, so close that it's hard not to trip over him.  He has become a kitty that's easy to love, and we would keep him except for one thing:  Munchkin.

Munchkin turns into a monster when Buddy is near.  She hisses and growls and chases him.  In order to keep the peace we keep them apart part of the time, Munchkin upstairs and Buddy downstairs.  Even then, she skulks around, looking for him around every corner and acting skittish.  This has been going on for a couple of months now.  Our other two cats have finally accepted Buddy but I don't think Munchkin ever will.  We are now trying to find another home for him.  We will be sad to let him go but it seems the only answer to the present situation.  I want to make sure he finds a good home, someone who cares for him as much as we do.