My girlfriend of 7 yrs tells me she wants too be alone and i've never felt so hurt in my life?

we have a 7 yr old son together also she says she still loves me but she needs too do this for herself we don't live together and we never had she tells me that i havn't done anything wrong and that its her but she gives me no reason she just says she needs too do this my heart is broken because i envisioned us too be together forever i really don't know what too do we have a son together and therefore i have no choice but too interact with her i feel so sad and angry at the same time i know its all apart of being heartbroken but can anyone give me some insite on what i can do too help maintain or maybe help me get her back