i was and am open with my wife. She doesn't always approve of it because she worries for me, but sh@t bro, your only 19 and your gf thinks she's the boss of you? Kick her ass out if she's living with you and dump her. No pussy is worth your enjoyment this early on in life. You'll learn, as we all have, that women will come and go and it's not worth it to waste your time over these girls..
MEN: DELETE YOUR HISTORY!!! Click on your tools/internet options and delete your history and cookies.
It's very simple to do and they won't trace you. Women are notorius for snooping your history to see your porn, etc..hell, i'd password the computer if I was dating someone..girls think they have a right to everything just cuz they be spreadin legs..bs..