Tmi but what do I do

So I slept with my bestie hes a guy and I was so worried that he wouldnt like me but he did what was awkward and I dont know if my ex was just big but his penis is really small like every time I moved it slipped out and he couldnt cum I faked it to make him feel better what do I do hes my bestie but I delt with bad sex for 3 yrs I dont think I could handle it anymore