Kitty Issues

Today may be the last of the beautiful days for fall.  I had to mail in my first weeks job contacts so I stepped out to mail a letter.  I enjoyed sitting out but fighting cats brought me back inside.  I get so frustrated with them.  I am tired of two of them fighting all the time.  Now they will be OK inside. If my Minnie goes out Pepper tries to stop her from coming back in.  If I lock them in they will eventually fight and the smaller cat Minnie will cower in the corner or hide someplace where I don't see her for weeks.  When I first figured out this was happening last year.  I would bring Minnie in after her being missing for a week or so.  She would hide in a covered box. By the next morning she would be gone and it would be another week or so for me to get her.  I have sprayed pepper with salt water until he is soaked in the back.  I have locked both of them in separate rooms. Neither of them liked that. Today Minnie was trying to wait for me to open the door to get in and Pepper chased her across the street.  I went in and got the spray bottle.  While Pepper was waiting to cross the street Minnie snuck up behind Pepper.  When he crossed the street and ran away from the spray bottle,  Minnie ran in the house.  Now they are less than 5 feet away from each other.  Both are resting.  It seems like a game to Pepper but not a game to Minnie.  She is honestly hiding and cowering unless I am there.  I know it stems from jealousy but I have tried to praise Pepper and pet him when he behaves well.  It just doesn't stick.  A few weeks later he chases Minnie away or tries to keep her from coming home.  Things have gotten better.  I see Minnie every day.  I know she eats.  I wake up at night sometimes to find Pepper at my feet and Minnie on my shoulder. I worry though that when and if I ever work again Minnie will disappear  and die somewhere of starvation because I could not monitor the situation and work.  I would love to say that my four legged children are more important than any job.  We all know that is not true. I have gone back and forth about giving up Pepper.  I don't want to break any one's heart even a kitty's.  All he has to do is stay away from her.  It's not much to ask but it's a lot for him.What do I need to do to teach him to leave her alone?  Suggestions are appreciated.  Take Care