me and my friend are two giant nerds... we're unattractive

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me and my friend are two giant nerds... we're unattractive and have only had a couple of girlfriends. Hes a virgin and I have only had sex a handful of times. We were working together to find a way to get sex on the regular, I would go to massage parlors to see which ones offered "Full service" he would browse craigslist to find prostitutes who had all their teeth.
We also started talking to girls on facebook and found one who was nerdy, very fat and who also was in a sexual dry spell... when we met up, we hung out, then eventually, me and my friend took turns having sex with her. We've been meeting up with her on the regular... and taking turns with her. Well recently I found out, a couple of weeks into the arrangement, my friend got a girlfriend... and they've been dating one months now, shes a very very sweet girl, and I know they're supposed to be monogamous but not only is he continuing to go to our hook ups, hes also began going to the massage parlors I found that provide extra services. I don't know what to do... I've thought about at the very least, cutting him out of the arrangement with the fat girl, so he doesn't give her or me anything he picks up from the asian parlors, but he is still risking his girlfriend's safety, because I know he isn't using condoms when he goes to those parlors. What do I do?