Hi folks

I am hoping that someone might be able to help me out.

I am a Brit and my girlfriend is American. From 2009 to 2011 she was doing her Master's in the US. I visited a few times, traveling from Guatemala, where I was living at the time (living as a tourist, leaving the country every 90 days...immigration control is very relaxed there). I work for a freelance research company in the UK and work remotely and I choose not to live in the UK, although my bank account is in the UK and I use my parents address for all correspondence. I am also writing a book, but that is not a paid activity.

Anyways, in September 2010, I was attempting to enter the US from Guatemala and I was taken to secondary questioning where I spent 4 hours being questioned by a number of different CBP officers. They thought that I was trying to live in the US (my previous visit to the US had been in February 2010 and I had stayed for about 6 weeks...previous to that I had entered in September 2009 and had stayed for 3 weeks...previous to that there were a few transits from the UK to Guatemala and one stay of 2 days in December 2006).

They eventually let me enter and gave me the usual WT stamp in my passport. I visited an immigration lawyer in Boston and she said it was strange that I had been stopped. I left the US in November 2010 and moved back to Guatemala. In September 2011, I moved with my girlfriend to Mexico, where she is working for the government. She has residency here but I don't. I went to the immigration office in Mexico City and they told me that as we're only planning on staying for a year, it isn't worth me applying for residency and I should just keep leaving the country and coming back in every 6 months on a tourist visa.

We want to spend Christmas in the US but I am a bit worried that I will be stopped again and, in the worst case, refused entry. I am only planning on being in the US for a week and have an outward bound ticket back to Mexico. I recently applied for the ESTA since my previous one had expired and it was approved (I should mention that I transited through the US in April 2011 on my way to the UK and had no problem).

Basically, what I want to know is if I should be worried about entry next week? I will some documents with me to prove that I am planning on returning to Mexico (I have a very expensive lease here and I can take some of my girlfriend's pay checks). I just want to have a relaxing Christmas with her and her family. I know that much of it is down to the individual CBP officer, but have I done anything wrong that might impact my chances of being allowed entry?

Many thanks in advance and Merry Christmas one and all!