The girl I've been seeing for a while and I were out for a few drinks and then ended up back at mine. I share a house with three other guys all studying at the same university. When we arrived back one of my housemates was up and she started talking to him and flirting (kneeling down beside the chair he was in and moderate kino) as if I wasn't in the room, after 10-20 minutes of this I left the room to make food and order her a taxi home. I came back into the room and gave my housemate a look to leave, he left, I proceeded to tell her her taxi had arrived and she was leaving. She began to get close and sexual but I was pretty pissed off so told her to get her things, speechless she left and I woke up with a series of messages from her asking what she had done wrong.

Is this an automatic next?

If so, should I phone her and explain that her actions were unacceptable to end it or just ignore her texts?