What is the meaning of 'I don't know' ?

[Lucifer_01]

From last month, I m concerned about my relationship. I can't match my vibe with my girl. I was not feeling love by her.

Now today when I ask her "Do you love me?"
at first she gets angry and then trying to stop me
I hate to do it but. I force her to answer me and

She said "I DON'T KNOW"

I don't know what to do, I just said good night and left.

I Don't know what is the meaning of this 'I don't know'.

Updates

+1 y

Great Today she said... she don't feel love about me.

[Anonymous]

If your partner don’t love you, or ”don’t know if they love you, then just leave. Dump her. You’re wasting your time with her as she will leave eventually anyway.