Baby daddy drama

So my sons dad has this thing he keeps doing; calling me on video calls randomly, not asking if I can talk or if I’m alone. Last time he called my boyfriend and I were just about to take a nap. I always decline the call and he’s being dramatic and asking me lots of unnecessary questions like I’m his girl. And to Topp it all off...he’s been MIA in our sons life, my son turns 7 and doesn’t know his dad. So tell me why I should be entertaining his ass if it has nothing to do with our son