Correct. Hope you didn't go that route. And as Xoved said, she may have cheated and is feeling guilty. What happened after all this?

Without knowing your guy's history it's easy to take this out of context. So I'm curious is there any history of cheating in the relationship?

Clearly there is a lack of trust and safety; two very important needs foundational to any healthy relationship.

Her reaction does seem disproportionate to your actions, if we are to take it at face value. Certainly there's been something brewing for quite some time in her psyche surrounding your faithfulness to her, though its hard to discern how much of this is a result of her baggage and how much is a result of the relationship itself, if at all.

I would definitely not feed this anymore as its all ego. Let her cool down, if still she's willing to end the relationship because of this then that's on her, but apologizing and agonizing over this will not help put you in a better position both with her and how you feel towards yourself. She may be beyond reproach for a bit, again that's why you need to let her come to you otherwise she can be sitting there feeling justified in her anger and by you contacting her she may still be in an egoic state and on the attack again.