hello!, new to the forums

i've been practicing PUA skills since 2008 under the training of David Deangelo and Mystery so i know my way around the game
Ive come here cause i need help with a specific issue
I have a GF and im happy with her, but still would like to hit on some other girls from time to time...man stuff i imagine most of you can relate to the feeling
i meet girls here and there and i run game successfully most of the time, i get IOIs no problem, but my giant roadblock is the fact that i dont like to hide the fact that i have a girlfriend, and it completely stops my targets on their tracks, a girl may be giggling with me non stop, giving me tons of IOI but if i attempt to go for the kiss i get a wall of rejection
i honestly dont have good answers to questions like "but you have a girlfriend, how can you like me?", "how can you do this to her?" its quite weird, the girl is totally into me but i just cant make her go over her image of being "the other girl" and not "the official"
pretty much any girl thats attracted to me in any level see me as BF material, i cant manage to make them want just an adventure with me
i know there are morality issues at play here and if you dont agree with what i plan to do it's ok and i respect your opinion, but still would like some tips on this
Thanks Guys!