Can anyone help me with this?

So first let me explain that a morail is a type of romance which is a lot like best friends. They generally protect each other. Usually one of them is more protective. With that being said here's my question.

So I have a morail, but I don't know if I really want to be her morail though. I recently met someone else and I think I want to be his morail. The problem is that I don't want to deal with telling my current morail this especially since she already hates the guy I want to be my morail. Who should I pick? How do I tell her if I do choose him? 8(