One of my characters gave in too easily to someone else. And very early on in the book, between two main characters whose personalities are both abrasive (they just happen to be abrasive on different up waves from the other). This troubled me until I thought of House.
Powerfully unchanging bastard (though he changes in tiny, tiny bits).
So with a few strokes of delete and adding a few more thoughts, I changed the relationship back to its more correct course of sheer bloody bull-headedness on both sides, with plenty of opportunity for mistakes to happen with the fault originating on either side (and sometimes both).
That ought to make things a bit more fun.