How often have you actually acted upon them? This doesn't mean that you never feel jealous or suspicious; it means you can put those feelings aside and believe in your girlfriend. When we went on our holiday I noticed a bit of distance from her, but when I questioned her she just insisted she was tired from the travelling etc so I didn't question further. I asked her why she was with him and why we ended, she said because I pushed her away, and he was there and how he never left her like I did People who cheat are seldom remorseless and can be highly confused about their own motivations. You can follow the guidelines of breaking no contact here.
It's been about three weeks now of sparse contact and the last email I sent yesterday was an email to her apologising for my neediness and that I respect her decisions which I actually do and I wish her the best.
11 Warning Signs That Your Partner Is Seeing Someone Else
Hang on tight. The 6th month however was the worst. Perhaps for the time being, it might be better to go into no contact to give her some space to let go of the bitter emotions she may be feeling. So dig in and soak up some knowledge. I need to get over my more inappropriate feelings and I can't go back without forgiving her for making mistakes or not waiting for me. Did she get a new job?