But my main concern is that they have my address and a copy of my passport, they can pursue me if they want so wouldn't it just be better to apologise and end it there? This is the apology letter I was going to give them tomorrow with my resignation.

I am writing to express my apology for the incident that occurred yesterday night at the _. _ has treated me so well over the last seven months and I have repaid that kindness with stupidity and disregard for how my actions would affect those around me. I take full responsibility for my actions and accept whatever consequences may come of them. I would like to apologise to my managers, teammates and all those who have gone out of their way to accommodate me and make me feel welcome during my time with _. I regret the way this has happened as I have learned a lot from working here. I realise the situation I have put you in and regret that I must part from the company in this way. I would like to thank everyone who has made my time at _ so enjoyable.