the other is a hell...! are really they?

'the other is a hell' somebody said by quoting the celebrated french philosopher Jean Paul Sartre. how the other becomes hell for Sartre?
because you and I are called to be models in front of others, that is to say when you do something, it should be perfect so much so the other will never get a bad example from you. we are living in a community, therefore, we are always asked to do only good deeds.
Meantime, what happens to me?
for me the other becomes a hell? i cannot do all the mischivious acts, becaus the other is watching you. in other words on the one hand the other is not really a hell, and on the
other hand the other is a mystery, the other is a project.
so let us respect the other...!!