<human>: Can you condense the text into a few key points?

My friend [18 M] and I [18 F] connected on Tinder and have been talking for over 3 months. I consider him one of my best friends, and we talk on the phone a few evenings a week and text everyday. We have phone sex and text, as well as call each other bae ect. however we are not in a relationship because we live 5hrs away from each other. 

The problem is that I have been sleeping with other people, and while encouraging that he does too, he doesn't. The other guys are purely fun, and I avoid mentioning them to him. We have defined the relationship as not official and that we are just friends (with benefits) and have spoken about it a couple of times, but he doesn't say how he actually feels about the situation. 

He agrees that it's okay that we sleep with other people, but gets mad if I accidentally reveal that I have. I recently slept at his house, resulting in a fight after I left because he thought my 'sex skills' revealed that I have been sleeping with other people. The argument makes minimal sense, but although I avoid mentioning other people and he agreed that our relationship is 'open', he got really upset saying he thought I really liked him. 

I do like him, and he is one of my best friends, but I don't plan on changing my relationship status. We clearly defined what was happening at the beginning and it was reiterated, but he still gets upset with me. I don't know whether to end the friendship before I hurt him even more, or continue because we're both going through hard patches and love having each other to lean on for support and friendship.
<bot>: Long distance friends with benefits gets upset and jealous of my sleeping with other people, I cherish the friendship but am not sure if I should break it off if it's hurting him.