I'm Jealous Of My Best Freinds ?

So My Best Friend She Just Got A new Boyfriend the other day and i dont why but im really jealous (IM A GUY) like i like her as a friend but i just kind of get like all weird felling when im with her and her boyfriend but its not just me its with other people but still its kinda of annoying when there like making out and its AHH does anyone ever fell that way?