Flirting with a coworker I didn’t know was married?

I was flirting with a coworker and been meeting up for breaks with him for a few weeks. He never mentioned he had a wife, and we had been messaging/flirting and it never went any further then just flirting. She found our messages on his phone and confronted me, I gave her an apology and told her I didn’t know he was married and I wouldn’t of gone there had I of known, she is still giving me abusive messages. But she works in the same place. What should I do? I’ve blocked both of their numbers.
Flirting with a coworker I didn’t know was married?
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