What do you want? Not simply within the framework of one vs the other; if you had freedom to choose how you moved forward, what would it be? You said maybe neither, but most of your answer didn't mesh with that.
I know sometimes you're stuck with 2 bad choices and have to pick one; however, I wonder if you have to be the one to make a choice here. At any rate, if you actually want to maintain relationships with both women, I question that you're obligated to pick. They may not have a friendship, but that's not essential to your having two relationships.
Working with a therapist sounds like a very positive step for figuring out what is best for you. Good luck!