I'm thinking of pretty much abandoning my abused friend
Why do you want to abandon your abused friend?
This friend of mine is no longer an attractive friend to me
You should always be there for your friend as they are always there for you. Talk to your friend and help them get through their troubles so that your friendship can remain strong.
That sounds like too much work.
You are not being a good person here. Abandoning your friend during their time of need is such a crappy thing to do.