Re: The "you have a girlfriend" objection
Outside the social circle is always the easier.
I think if you do want to by pass the GF thing you can address it or ignore it. Theres no third option. If you address it make sure you're framing it as if you are still with her. The idea is to get the girls you're gaming to chase you regardless of you being single. Look at who have better chances to do this. Celebrities, comedians and rock stars are usually scene as figures that can have promiscuities because of the association to the social life. Its not always true but that's what we defined as apart of the social conditioning and stereotype. So how do you apply this to your life? Start by making yourself appealing to their interests or work within yours. What tends to happen is that commonalities form quickly when you both know certain subjects. When you get to be in person with them you can wear down their walls by building and slowly starting to break rapport. What i'm getting to is the 'it just happen' card where you don't do the talking and let things escalate without definition. When you're hanging out with the ladies just surprise them at the right moment with a kiss. Make sure you got their attraction for you before you do. I believe thay you can still approach anyone anytime but you need to be able to game them like you're gaming yourself into being lost in the moment and letting the moment rule--not by your mind.
To summerize--isolate, comfort build and then get them to give you solid signs that are screaming at you and then surprise them. If they keep brining up your girlfriend then you havent built enough attraction with breaking rapport and keeping the girl distracted by you are rather than who you are associated with.
The idea is to make her chase you.
Every moment counts, get out of your head and enjoy it.