What to do if your boyfriend feels uncomfortable and suspicious abt ur relations with ur bestfrnd who is a guy

i and my frnd have been like best frnds from abt 14 yrs.my boyfrnd too knows my frnd and he has always been suspicious abt my relations with my best frnd.he does trust me but at the same time doest like me going out wid my frnd or us being together for a long time.he tells me tht my frnd is trying to take me from him and we constantly have fights on tht..if i support my frnd..my bf says..tht i dont give a damn to him and i've never been too supportive to him as i am for my bestfrnd.i'm pretty worried coz of the daily fights between us.we both love each other and we dont want to get separated..but at the same time i dont want to lose my bestfrnd..he's been with me and has known me from abt 14 yrs..i dont want to hurt him...wht to do??????