I sympathies. I'll just tell my own anectdote so you can see that this kind of crap goes on all the time in other groups, too. You are not alone. I had a great group of RPers that sometimes acted like a soap opera (I was lucky in that the drama did not directly harm me outside of some awkward sessions.). My group of 2 years consisted of a couple (Sam and Patty) that had been dating for years, and another male (Chris) and female gamer (Lana). I did not use their real names, but I found that names helped with the story:
Lana was interested in a coworker. Lana had never dated before and was a bit unsure as to what to do. Patty took it upon herself to help Lana along with getting the budding relationship going.
Patty then took it upon herself to have an affair with Lana's new boyfriend.
Patty began to tell Chris things, hinting at the affair. Chris suspected it and told Lana.
Sam and myself had no clue that any of this was going on. We just saw Chris snubbing Patty, and trying to get Lana to do the same. Patty played innocent and duped Sam.
Lana broke up with her new boyfriend, who continued to see Patty. Patty then broke up with Sam after her affair had gone on for three months. Chris did the "I told you so" dance.
Needless to say, the group was dead.
I'm still sitting behind my screen scratching my head.