Why does my boyfriend keep doing this if he knows it bothers me?

Anonymous
My boyfriend added a girl on snapchat and Instagram. He would talk to her everyday on snapchat and like her pictures on Instagram. I told him how much it bothered me him talking to her and he still kept on doing it like if he didn't care. I know the girl so I asked her what was up and she said they were just friends and that she would block him if I wanted to and I told her that it was really up to her if she blocked him or not and she did block him on snapchat. My boyfriend found out she blocked her and asked me if I asked the girl to stop talking to him and I said no she stopped because she wanted to I didn't make her stop and he said okay he was fine with it, but I've noticed that he likes her pictures on lnstagram even from a couple days after. I don't know what to think anymore because I told him that him talking to her and liking her pics bothered me and he still keeps doing it
Why does my boyfriend keep doing this if he knows it bothers me?
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