I havea boyfriend but it's only been a couple months and now im starting to fall for my friend what should ido

me and my boyfrined only been together for a couple months and i have known the dude i'm starting to like for a while and i mean i'm really feeling him he is all i can think about and i know he likes me back because he told me and he kissed me but i just don't wont to hurt my boyfriend because he tells me he is in love wit me and im the only one he wants to be with i need to know what to do and how to do it