Let me send you a different viewpoint than you may have heard: I think you SHOULD think. And what you should be thinking goes something like this:

I dont’ deserve to have this type of relationship. I deserve someone who will put as much into it as I do, and life is too short to settle for less. My daughter deserves to have a role model in her life that will prepare her for a healthy male/female relationship. I am moving on: I am capable, I am whole, and this is a positive move for ME.

There. That should run counter to the usual tide of crap that people spout. Think away. Your thoughts should support YOU.