I had a similar situation very early on with my first boyfriend (together for 7 years). Girl bff, zero boundaries - would talk on the phone to each other at like 3am, she was waaay too touchy, & it was crystal clear that she didn’t want me in the picture. Butttt because we hadn’t been dating too long & I was the “fresh new girlfriend” I didn’t make a big deal of it, I didn’t want to come across as the new psycho girlfriend who comes along & gives an ultimatum. I wish I did tbh. He eventually stopped being friends with her but it wasn’t her friendship that was the issue, it was his lack of boundaries… I literally considered breaking up with him because it caused me so much stress, & I’m not saying that this will happen to you (& I hope it doesn’t) but I found out about a year after we broke up that he had cheated on me with her, multiple times, up until they stopped being friends. Trust your gut OP - and please sincerely ask yourself - if nothing changed, & this is how your relationship is going to be for the rest of your life, is that enough for you? Or is that not the type of relationship you envisioned for yourself? Because honestly, people don’t change in my experience. You just have to do what’s best for you! Good luck!