I have recently found out that my girlfriend of two years has been cheating on me with another man. I’m sure its all finished but now she is pregnant and admits she is unsure of who the father is. I love her and I want to be with her but I’m very hurt and I’m so worried about the outcome of this and that I might not be the father. We are both young and not ready for children and all of this so stressful I’m starting to wonder about my mental health. I am still amazed that she could have done this. She wants us to be a happy family and so do I but every night I lie awake thinking of what she done and am I the father. I don’t want to leave her but at the same time its killing me to be with her its been two months since I found out and its not getting any easier. Also she has not told any of her family it might not be mine and expects me to pretend that I’m excited about all this when really I’m dreading the thought of it. Please help there is so much for me to deal with and I don’t know what to do. Maybe you can't answer a question like this but do you think it would be better to support her during pregnancy or distance myself to spare my feelings if the child is not mine?

Please help people. I have seen questions like are my dreams telling me something and stupid questions by 13 year old girls been answered this is really affecting me and it's a legitimate question