What do you think about...?

Hi teachers.

I would like to know if the sentences sound ok.

What do you think about getting married?

Does it sound ok? If so, what does it mean exactly?

I am getting married. What do you think?

Or I have thought about getting married. What do you think?

I would like to describe this situation.

Guy A has a girlfriend and I want to know what B (a friend of A) thinks about that.

If he feels happy or jealous...

Is it ok if I ask..

What do you think about him (A) having a girlfriend?

Thanks in advance~