['I have been faithful to my girlfriend of almost 3 years now', 'Glad to hear that,  I hope you continue to be faithful to her in the future.', 'I plan on it, I cannot stand cheaters, that is my biggest no go']
I agree, is you are not happy in a relationship anymore you should first end it and only after be with someone else.
I have been faithful to my girlfriend of almost 3 years now