Esta and estas are different, but have essentially the same meaning. Estas and esta are the present tense forms of "estar", which means "to be". Estas means "you are", and "esta" means "he, she or it is". The verb estar is used for more immediate feelings/actions.
No estas casada translates to mean you are not married in English.
you are killing
you are demented
"You are in my life" "You are part of my life"
In a question: Are you busy (occupied) In a statement: You are busy
No estas casada translates to mean you are not married in English.
"y como estas" in English is: "And how are you?"
you are far
"are these cool"
"Are you possessed?"
"Con quien estas" translates to "who are you with" in English.
you are killing
"Right wher you are"
"Que chula estás" can be translated to "you look so pretty" or "you are so cute" in English.
you are demented
In English that would mean: "How are you Miss?"
"Estas en la escuela" in English means "You are at school."