I agree with the above opinions...
Actually there are many lovers loyal enough...
It seems that your attitude is not right...
You only focus on your girlfriend is not loyal to you...
However you forget that you actually is not suitable for her...
There must have a reason for her to commit this mistake...
Although she is not right, you should also bear the duty...
Do you really get along with her well?
Do you treat her well?
Do you really understand your girlfriend?
You should have self- criticism too...
To find the stortage you have...
And try improve youself when you fall in LOVE next time...
After a painful experience, we will be stronger & clever...
Wish you find your true LOVE oneday! ^_^