I Love My Mom

I live with my mom
we are alone since my father died two years ago

But a close friend for my father keeps visits us
He acts like a father to me and takes care of us always

I was wishing him marry my mom, but he is married
Recently he became speaks a lot with my mom
I do not know what they're talking about
because my mom became tell me to go to my room when he's around

Are they talking about some work
Or about my future
Or maybe there other secret???

How can I know that?