Girlfriend suddenly broke up with me after miscarriage?

Been seeing this girl for a year and things got pretty serious shortly into the relationship. She had a daughter (9 year old) but didn't mind. We did everything together and she definitely was in love with me and I was in love with her, but recently she said she felt like she was being pulled apart by me and her kid. I did my best with the child but she blow hot and cold and started to be more cold. We had a talk about it but then I proposed and she seem excited and was even looking at wedding dresses etc. She then became pregnant and we were excited. Then she called me to say she had a miscarriage and that she doesn't want more children and that she wants to be single and concentrate on her child. Felt like my life just got destroyed in a day. Any advice?

Girlfriend suddenly broke up with me after miscarriage?
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