"I know you probably have a lot of questions about what happened and why baby... but now is not the time for that. You see, over the last few months I've learned a LOT about myself and I've come to realise that when we were together I was very 'narrow' when it came to my opinions about... sex and stuff like that, but I've changed."
She pauses for a second to try and gauge your reaction... then continues.
"I want to tell you... you know, I 'found' some things out about you that I didn't want to know, things I couldn't handle back then, things that made me feel a little 'sick' if I'm honest... but things are different now."
She smiles slightly wickedly.
"I'm guessing you're not seeing anyone, right?"
You tell her 'no'. Truthfully you still love her, you want to tell her but you can't yet.