I highly doubt they were dating before. I think it was just her walking in on him and some random woman and that shock just stayed with her I guess. Idk that's what I think ╮(￣▽￣)╭
In my opinion, I think both of them weren't dating, instead they had mutual feelings and it was prominent, but beomi might have slept with that woman, by who knows the circumstance, maybe she was trying to seduce him? And she just walked in accidentally causing a big misunderstanding.
She entered the wrong room and saw him there with other woman.
She entered the wrong room and saw him there with a woman.
This is so hard to say. So were they dating before? and she caught him cheating? mmm, i dont knowww...