The only thing you've done that was stupid was ask a young woman to go without any real contact for a couple years at a time (other than few, short visits). LDRs are hard.

If you do decide to end this, then you shut down all contact. Block her on phone and social media and email. And don't relent.

I don't think you should be angry at her, you were asking a nearly impossible thing of her. Date locally. Be realistic.

She'll survive, and so will you.