Boyfriend stopped hanging out with his female friend because I told him about relationship boundaries?

Hi All, Me and my boyfriend are together 3 years. My boyfriend used to live in a shared flat when this girl moved in. Since start they seem to become friends. She gifted him a book, gave him access to her netflix, she developed similar interests as my boyfriend, like warhammer, games, music bands. I noticed straight away that she would talk to him a lot, but won't communicate much with me or had intentions to become friends. Sometimes he would text me saying he is out for a walk, but would not specify with who, unless I ask indirect question and he would admit that she invited him. They lived in the shared accommodation for 1 year with other housemates and I am sure that there was no physical cheating because I know my boyfriend loves me and I am the n.1 for him and I was around often. We moved in together last year and I noticed that he would play games and voice chat with her more often and even wanted to invite her over for Christmas. More often he would not say that he was about to play with her, I would just walk in the room and find out. She even bought him a game extension without occasion. For a year I was hiding my jealousy and not saying anything because didn't want to come as controlling freak and obviously break the friendship but with that Christmas invitation my jealousy skyrocketed, but still I said, no problem invite her over. Till the point when I said I can't take it anymore and had a serious conversation with him about boundaries being crossed. I discovered that they were texting almost everyday and she would tell him a lot about her problems. He said that he has naive character, but he would not play games with her and would not contact her. He said that he honestly talked to her, saying that it's better they won't hang out and that she was sorry for being too friendly. My intention was for him to set boundaries, not breaking up friendship. Am I a bad guy? Or there was a really valid reason for him to terminate friendship?
Boyfriend stopped hanging out with his female friend because I told him about relationship boundaries?
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