##Context## We are both 29 we have a kid together who's 7, we've been together for 13 years. We were renting our own place a few years ago but unfortunately, we both lost our jobs and could no longer afford it. I worked in IT and my girlfriend we'll call Becka, worked as a private groomer. Becka remained friends with her all her ex's and their families but one we'll call Justice. His mother offered for us to rent a house on their property. Justice introduced us cause we were both single and looking and i've been his friend for 5 years and that we would be good together. Justice no longer lives at the property, he lives with his wife and their two kids 50 miles away.
A few days ago Becka pulled me out onto the porch while we were visiting with my family at their house. She then proceeded to tell me that two weeks ago while she was with justices mom helping her watch his kids for his anniversary. I was away when this happend but i was told that she was gonna leave in the morning when they got back(they flew to Hawaii for 3 days for anniversary). But apparently they came home late at night and there were no extra beds so they all decided that becka, justice and his wife would share a bed. At some point in the night he started to feel her up and try and play with her for a few minutes. she ingored him and that was that as im told, she left in the morning and has been talking with both my sister and her sister ever since worried that i would act this way. And to those of you who are thinking yes I am overreacting. Justice's wife we'll call Tami is apparently the woman they had a threesome with when they (becka and justice) were together, and the order of people in the bed was becka justice tami, and it was no accident as becka and tami have vastly differnt body types and hair length. She wants me to "suck it up and play nice"(my words not hers) cause it would make things difficult and she wants to keep him and his family in her life. Am I just being insensitive or something I really don't know, I feel she's gaslighting me by full on admitting that by saying he "molested her" but then mad when i bring it up.
---EDIT---
I have for the most part already made up mind, this was last attempt to try and see any and all perspectives before talking with her Tuesday.
I've chosen to spend the last couple nights at my families farmhouse to reflect on everything.
but she's not afraid of him or what i will do, I have 20k saved up so we can move as I've taken care of his and his mom's property in exchange for housing and I am employed and make a good amount, and we have a pretty nice lifestyle.
I'll give an update tomorrow p.s. I've just got in contact with Tami and things were not what I thought and I'm meeting with her to talk.