I need advice!!!!!

So my daughter father &' I was separated for three years we got back together in ending of June beginning of July . I forgave him for all he done to me ; getting back together with him I accepted his son as my own , he purposed to me on august 17 of
Course I said yes because this was something we spoke about in our teen years august 18 the day after his son mother wrote him saying congratulations you going to be a father again . She waited until she was 3 months pregnant to tell him she was pregnant now she is currently 5 months pregnant having a baby girl , he doesn't claim the baby because he feels like she waited to long to tell him &' because she cheated on him multiple times he wants a DNA test now idk how to feel about it !! Advice please 

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