So this might be super long but I will do my best to summarize.

First I’ll give a little backstory on my ex best friend (we will call her Jessica) and my relationship with her:

Jessica and I had been best friends since we were 15. We did absolutely everything together and I honestly considered her a sister. There’s tons of red flag situations that happened in high school but I’ll leave them out because this is already a long story.. Our first major falling out happened the summer after graduation when we were 18. I had started dating my first serious boyfriend 6 months prior to our falling out and noticed that she seemingly hated him for no reason, she would refuse to hang out as a group because he’s “weird” and she likes to hang out “just us” + our other best friend Monica sometimes. Jessica and I were hanging out less often because I was in the mushy phase of my first love.. that July (2015) Jessica and I got into an argument when I asked her when she would be able to pay me back $80 that she owed me.. I wasn’t even upset and I was just casually asking her but she FREAKED out and called me all kinds of names before slamming my car door and leaving. Once I got home I realized that she blocked me on EVERYTHING. I tried to reach out to her several times over the course of the next 6 months with no reply until one day she texted me apologizing and asking if we could meet up and talk. I stupidly agreed and once we hung out it was like nothing ever happened.

Fast forward about 2 years later and some bumps in the road between.. I began dating her boyfriend of 2 years (we will call him Scott)’s best friend (we will call him Jake). Immediately when I started dating Jake she was jealous and began hating him for no real reason again.. even though they had been friends for a year or so and never had problems. She would always ask me to hang out “just us” and would get upset if I told her I had plans with Jake. This went on for a while and in July of 2018 she got upset with me because I had told my boyfriend Jake that “she was annoying for calling me constantly and wanting so much attention”. Well because our boyfriends are best friends word of what I said got back to her and she was upset at me. She never told me this was why she was mad but began acting distant. I didn’t really think anything of it till September when I got a call from Jake telling me we need to talk about some things he heard from Scott. Apparently Scott told my boyfriend that Jessica told him all of my sexual history and that “I didn’t even like Jake, I was just using him for money and until something better came along” (which is not true AT ALL).. I was obviously upset about all this and it caused problems in my relationship but Jake and I ended up making up. I never really confronted Jessica about this because at the time I was super stressed out and my father was in the hospital dying so I didn’t really have time to deal with her drama. A month later (October 2018) we finally decided we should talk about it even though she was reluctant and I stupidly forgave her AGAIN and moved on like nothing happened. Since all that I didn’t really want to continue my friendship with her but felt like I had to because our boyfriends are best friends and it would cause problems in the friend group and be awkward if we couldn’t all hang out anymore. So I’ve tolerated her.. up until about a month ago when she was pulling the same shit of being upset when I couldn’t hang out right away and I finally decided enough was enough. I just stopped responding to her and she’s deleted me on all social media but we’ve both seemingly kept quiet about it all to our boyfriends to not cause drama..

Ok sorry that was a lot.. now to my dilemma on if I should tell her boyfriend all of these things.

- Jessica lied about her sexual history (I know, I know, it shouldn’t matter but her boyfriend is very conservative and to him it would) She told him 3 when she’s actually been with 20. (This is a very minor thing compared to the rest though and this I feel like isn’t my place to tell)

-Slept with an ex (right before she started dating Scott) when she KNEW this ex had chlamydia and didn’t even bother getting checked after. Had chlamydia the first 1.5ish years she was with Scott before she got tested. Didn’t even tell Scott when she found out she had it. Instead said she was “sick” and made him take a pill so he wouldn’t get “sick” too

-When they got in a fight October 2018 and we’re going to “breakup” but didn’t.. the night our boyfriends went out to bars she downloaded tinder and was talking to guys. Told me a few weeks later that sometime during their fight or a few days after she went and hung out with a guy she’s had sex with before from tinder but that “nothing happened” ... A few days later she went to the mall with Scott and ran into the tinder guy she hung out with and freaked out and ran away. Scott asked why she was being weird and she LIED about how she knew the guy and didn’t mention that she hung out with him RECENTLY

-She also sent me pictures of Scott’s morning wood while he was sleeping without me even asking and clearly without his consent

-She recently told Scott she wants to be in an open relationship because they weren’t having sex enough. She only wanted it to be open on her end so she could sleep with whoever she wanted but he could only sleep with her. He was sexually assaulted by a woman when he was 17 so sex has always been an issue for him and Jessica KNOWS this.

Some may say it’s not my place to which I understand and kind of agree and others might say that “if I were him I would want to know” which I also agree. I do care about him and he has always been a good friend to my boyfriend and I, but I feel like if I were to tell no one would believe me because they might think I’m just trying to get revenge or “ruin her relationship”.. I still care about her and would feel bad for telling but my conscience weighs on me heavy knowing all this information and not telling Scott.. I don’t know what to do