<human>: Can you give me the gist of the text in a nutshell?

Both in college.  2 hour drive apart.  Dating for 9 months before I went abroad.  We decided it'd be best for relationship/sanity to go on a break.  In the back of my mind I did want her to date, since I was her first real boyfriend so she didn't really experience college/real relationships.  I had.

Fast forward.  I thought about her everyday.  I realize how much our relationship helped both of us grow emotionally and intellectually.  W e lived together for 3 months (during the summer) before I left, and I think we're really compatible.  She agreed to get back together for winter break, with 'no strings attached' to the future of our relationship.  She admits she had sex with a guy a few times.  What should I do?
<bot>: my first love had sex with someone else while we took a break.  Don't know how to react or move forward.