Why, why, why, would you ever tell her!!!???
Fuck it, the damage is done. She will get over it. But seriously, it is a good thing for you that you have such an honest girlfriend. Guys like us need girls like that... Tell her you will stop, but keep doing anyway seeing that you are making such good bank. So I am basically telling you to lie which could have been avoided if you hadn't told her in the first place. Jeez!
To be honest I felt like shit when I was knowingly deceiving guys through e-whoring, but when those cheques come in, it silences the conscience big time!!
So how much you bankin', anyhow?