Take it from someone who has been there. You can devote your time, energy and love into her and her innocent, lovely child. You may come to love that kid like your own. You may learn what love really means when you know you would not hesitate a moment to throw your life away for that child. You can be a great man and prove to that women that you love her and her kid as much as the universe is wide,,,,,,,
but anytime she wants her way or she wants to hurt you (men use to hurt you with their fists, women hurt you in devious ways) she will use the innocent child. Saying things like she is not yours anyway so dont tell me how to raise MY child or that fella may decide he wants a wife and kid all ready to go and she will go back.
There is the possibilty that you will live happily ever after like snow white but odds are against you after her leaving already
No matter I what I wish you well, Like someone said if you get on the love boat you will come to love that child like your own and she will use that because she is not good at punching you, wrestling around, shaking hands and then going drinking