I'm sorry
Maybe she just doesn't know you well enough yet and doesn't want a kid brought into an unstable environment (if you were unstable for example) She probably just doesn't understand and is looking out for her son, you haven't been dating long when she said it have you?, most parents tell their kids that regardless of a psych diagnosis.
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“All the darkness in the world cannot extinguish the light of a single candle.” -St. Francis of Assisi
Diagnosis:
Schizoaffective disorder Bipolar type
PTSD
Social Anxiety Disorder
Anorexia Binge/Purge type