Hey guys, I finally confronted my GF with all the evidence I had gathered. We had a LONG talk and we both decided to keep on going with our relationship. It was partly my fault for neglecting her and not giving her the attention she needed. I admit I have been taking her for granted lately since I never ever believed she could 'play the field'. We talked about both of our shortcomings in our relationship and how to best remedy them. So everything is fine between us now but I am still going to 'keep an eye out' just in case. I don't want to be blindsided by another incident of the same nature again.
I would like to thank all those who commented in this thread. Your insights have proven to be invaluable and helped both of us a lot. Again, thank you and more power to iSTORYA.NET.