My boyfriend has a girl best friend

Grace

So my boyfriend has this girl he was somewhat friends with before we dated. They weren’t close or anything, but she thought they were bff but he said no lol. She did really like him and then we got together and she backed off, but still texted him a lot but I didn’t mind. So then she kinda got between us, she snapped and texted so often it was really frustrating to me and it was starting to really bother me. He didn’t respond to her much anyways but she never got the hint. So he deleted her and kept his distance, but then a couple weeks ago I told him to add her back because I felt like I was being controlling. But guys, it’s every day, all day. She is snapping him and he is talking back. I got to be friends with her but I haven’t known her very long to really trust her and I trust Trey but anytime I bring it up he gets annoyed. I know he’s not cheating but what would you guys do?