No, dogs can stop liking each other at any time, there are people with dogs who lived together fine for years and years, until they didn't. It really depends on the dogs if they can be safely around each other, if they are getting into fights all the time it's not a good situation for anybody and better to keep them apart. If they are fighting over something, toys/food/etc you can maybe manage it if you are on top of things but if they are just fighting whenever they are together don't force the issue, it's only going to get worse and end up with injured or dead dogs. Some people do tie downs so they are out together but can't contact each other, kennels, x-pens, my dogs get along but there are times they need to be kept apart, if food is involved, toys/chew time, any exciting moments like company. I have an x-pen and my kitchen babygated off so I can have all 3 dogs downstairs with us but not interacting with each other.
I put some good links on multi dog homes for you, please realize finding a home for any adult pit bull is next to impossible, nobody wants them, especially not one with a history of dog aggression, even if you decide to rehome him you will likely have him for years trying to find a responsible forever home for him, lots of people who shouldn't have them want pit bulls, most don't once they realize the breed traits like you have, or they can't find a place that accepts them, bsl and restrictions are everywhere. http://www.pbrc.net/multidogs.htmlhttp://www.badrap.org/what-expect