You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.
Love may be or it may not, but where it is, it ought to reveal itself in its immensity.
We're all looking for those moments - a relief. That's why people go out and treat themselves.