I'm in a relationship and I don't want to cheat on my girl obviously. But I do go out with my friends, and I do my best to get them laid, like a good broseph should. (I like the seduction community, analysis and methods, so I still read up even though I'm in a relationship)

My winging basically consists of me occupying the targets friend, so the target doesn't feel like she's abandoning her friends while making out with my friend ;). I flirt with the targets friend(s), to keep them entertained and interested, never escalating though. I do this for a number of reasons, I'm sure you all understand them.

Whenever they find out I have a girlfriend they will instantly lose interest, and my winging fails. Or I reject them some other way if they get to the point of escalating or insinuating too much, and it'll usually be so far into the harmless flirting they get offended (which I understand) because it's a pretty blunt rejection. And I feel that this may interfere with my buddies chances of meeting up with the girl again.

So basically how do I disqualify myself without the obstacles completely losing interest?

I guess this same problem applies when the target in the set is the only attractive one and you don't even want to close with any of the obstacles you're distracting.