My boyfriend keeps communicating with his "girl best friend" even after I've expressed that it makes me uncomfortable.
I (23F) recently discovered once again that my boyfriend (26M) is in contact with his "friend" after we had an argument. To give you some context, we've been together for four years, but we broke up a year ago when I found out he was being unfaithful—sending direct messages to other girls and flirting with an old fling. One girl in particular, whom I'll call D, really stood out. They would text constantly, and she often flirted with him, reminiscing about "the good old days." She would mention wanting him to pick her up for dinner, complain that he never invited her out, and suggest vacationing together. After we broke up, we talked things through, and when I confronted him about D, he insisted she was just a good friend from high school and that their relationship had never been romantic. I expressed my discomfort with how flirtatious she was and how he didn't set boundaries or tell her that her behavior was inappropriate. We eventually agreed that he would establish boundaries, refrain from encouraging any flirting or meetups, and would avoid discussing our arguments with her. I thought things were going well, but I recently discovered, through a peek at his DMs, that he is still talking to her. This is especially troubling since we agreed he wouldn't reach out to her after our fights and would stop entertaining her desire to "hang out." We even just moved, and he casually told her where we live, suggesting that she could come over since we’re close to downtown. I’m unsure if I’m just being overly sensitive or jealous, but I feel that he should turn to me instead of running to D, especially since it's clear she has feelings for him and he doesn’t acknowledge that. By reaching out to her, he’s only fueling the situation.