To upset outsider,
 These girls have been in your hubbies group since high school? In my experience high school kids have sex with each other especially when they are in a tight group.  It's gross, I know. Most of the girls I grew up with have kids from multiple "boys" in a group.yuk! Maybe said "girls" have slept with or wanted to at least, with you "outsiders" men. That would explain the hostility. You got what they wanted and maybe "gave their innocence" to. How awkward for them to invite you and then giggle about old times when they used to explore your man. Hard truth maybe, who knows.