3sum with two males

Ok so I need some advice ladies I’ve been with my boyfriend for about two years now and he recently just asked me to have a three sum with I’m fine with but he want a three sum with him and his male bestfriend which I’m not comfortable with a three sum to me mean two girls and one dude not two dudes and one girl I told him that I wasn’t comfortable doing that now he telling me I hurt his feelings and if I loved him then I would do it now he’s not talking to me over it I feel like this is real stupid should I just leave him I don’t feel like he love me now cause why would you want to share me with your best friend