Welcome to TFP!
As is so often the case with advice questions (and ESPECIALLY in Tilted Sexuality), you already know the right thing to do. You can rest assured that so far, 100% of the people posting in this thread are behind you on it.
I know it's hard to swallow in this circumstance, but it's a total no-brainer that your son comes first. That she doesn't know that too points to her selfishness and naivete. The lesson here is: be clear about that next time. The next girlfriend needs to know the deal. You and your son are a package. You can't have one without the other.
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