<human>: Dear Reddit,

My long distance GF of 6 months went out with her most recent ex. She never told me, and I found out by - unsuspectingly - looking through her phone pictures on my most recent visit. There were also romantic pictures of them together from when they used to date (hugging/kissing). 

When I asked her about it, she said they didn't break up on bad terms, and he was passing through town with another friend of hers, and had an extra ticket to a Barcelona game(she's a huge fan). The other friend didn't go, but she assured me nothing happened, and apologized for going out with him. She told me she'd left him so that she could be with me.

A part of me loves her, and the other part mocks the first part. I'm seriously considering breaking up with her, but feel too emotionally involved to cast a good judgement. 

Back story:
We've known each other since we were kids, and had a crush on each other since high school. We did charity work together, hung out for hours on end but never expressed romantic feelings then. We both moved to the states for college and haven't talked much since.

Fast forward 4 1/2 years: she graduated, and just took a job as a field engineer (6 days on, 3 days off, 12 hours/day shifts) for a major oil company in the middle of no where Texas. This hasn't made it easy for her; The new job and the new relationship. We used to talk every day, but more recently we haven't been talking as much.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: My long distance GF went out with her most recent ex. I love her, and see a future together. Should I break up with her?