How do I reject my boy bestfriend ?

Hi, so basically I don't like anyone at the moment and I don't plan on doing so reason being I'm trying to focus on my studies . 2 years ago my boy best friend told me he liked me and I shot him down but over the past few years we had disagreements he even got a girlfriend during this time, but they broke up after a month. Now he's telling me that he never stopped liking me and I'm also now finding out that his boy bestfriend also has feelings towards me. Plus I think my other guy friend also has feelings for me. I don't have any romantic feelings for any of them what so ever, so how do I turn them all down with out hurting their feelings? Pls help ╥﹏╥