Update: My [25f] boyfriend [26m] of 10 months is best friends with his ex [20s?f]. She refuses to meet me and it's getting weird

Link to OP: https://www.reddit.com/r/relationshi..._best_friends/
I wrote my previous post over a year ago, and a lot has happened since then. I wanted to give everyone an update, since the advice on this sub was really helpful at the time.
For a few months after I wrote my OP, nothing much happened. Jeff and I continued dating, and he continued being friends/partners with Jenna. I never met her, but everything else in our relationship seemed to be going so well that I decided I'd try to deal with it.
Things got really hard, however, when I had to take a work contract 12 hours away from home for three months. I hardly saw Jeff the whole time, and I looked at Jenna's instagram almost every day to see if she'd posted more photos of them together. More often than not, she had. Since I wasn't physically present, I felt like Jenna was his real girlfriend. I felt completely worthless and constantly stressed out, knowing my boyfriend was spending all his time with another woman who I already had suspicions about.
While I was away for work, I decided to break up with Jeff. I broke up with as soon as I came back, and I made it very clear that his relationship with Jenna was intolerable for me. I told him he was going to have a hard time dating anyone who wasn't her as long as she was still in his life. He kept saying he didn't understand why it was such a problem. He told me he couldn't control her behaviour, but he promised me he hadn't cheated on me. I explained to him that by allowing their friendship to continue, he was condoning her behaviour. I told him I didn't really even care if he'd physically cheated or not, since he'd already shown disrespect for me and our relationship.
I didn't speak to him for a few months and I went on with my life. I took another contract out of town and even considered moving permanently to another city. One night, though, Jeff called me and apologized. He said he had been thinking about our relationship a lot and realized he had been in the wrong. He said his relationship with Jenna was beginning to feel toxic to him, and he'd made arrangements to dissolve their business partnership. After that, I decided to meet up with him (not necessarily give him another chance) and discuss the situation further. When we met up, he promised to stop talking to Jenna and unfollowed her on all social media.
As of now, he has not spoken to her in six months, and we've gotten back together. We actually ran into her at a concert a few weeks ago, and they didn't even say hi to each other. I feel much more respected and confident in my relationship now.
TLDR: I broke up with my boyfriend. He ended his friendship/partnership with his ex and we have gotten back together.


Source.