[tamajiv176]

Firstly, I'm sorry to hear about the situation you're in. The good thing is that the ball is in your court and you can make the decisions here.

If the child is not yours that would mean your partner cheated on you right? You need to ask yourself if you want to be with someone like that (ignore the health issues she has they are irrelevant to this decision). Also you say you feel detached, well that will effect the child in the long term (children pick up in these things). Think carefully about if you want to stay with someone who has cheated and lied to you. If you can forgive them, fine. If you cannot then make the decision to leave.