With temporary break ups in long term relationships, what limits are there to behavior?

girlfriend and I split for a couple days. Live together. Dated 2.6 years. She texted an ex about banging a bunch of guys to get back at me. Uncertain if she actually did anything, but we were technically broken up.

No limits. You're entirely free to do whatever and whomever you like. You broke up.
Maybe a bit of flirting is okay, but long term requires certainty the relationship is over
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With temporary break ups in long term relationships, what limits are there to behavior?
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