I am assuming there would not be the angst here unless you are trying to decide if you have romantic feelings for your woman friend.
While this must seem huge to you and possibly the biggest thing in your life while meanwhile everyone around you goes on oblivious, resist the impulse to blurt your feelings out just yet.
My concern would be that your situation makes you needy. You’re divorced; you have children. Those are things that put a lot of pressure on you. Even if you do love her and she has feelings for you in return, no one person can meet all of another person’s needs. You need to be secure in yourself. You need to be OK when she is not around, and you are alone.
Put a big caution, slow sign up in your brain. First of all, you don’t know what you would tell her. You have said you are not sure how you feel, Next, you don’t know (or have not said) that she has romantic feelings for you. If you told her and she did not, what would happen then?
You don’t say how long you have been out of your marriage. How did you feel about that break-up? Emotional experts say (wisely) it takes a year to process all the feelings from a broken marriage (especially when the person was the father of your children). They strongly recommend not getting into another romantic entanglement during that time.
If you have romantic feelings for your friend that are real and true, they will not go away if you don’t tell her. I think you need to just be with your feelings by yourself right now until you can be sure of what you feel, until you can be sure your feelings are true and not because you are just lonely and desperate to have someone in your life. (Perfectly understandable if you did feel that way, just not a good place to make decisions from.) Try to bring some other friends and other support into your life to help you regain a sense of balance. Doing that will help clarify your feelings for this friend.
If the chaotic “not knowing” continues, think about talking to a counselor who can help you get some clarity and decide what is right for you in terms of telling your friend.
Good luck.