And now they are buying a house together
Is this a reference to a further sentence in this course?
Why did they break up???
Is this referring to the break up of a single-sex relationship or can 他们 be used for male and female couples? If it is the latter, can 她们 also be used in this way?
分手 'to break up' can refer to divorce, separation (i.e. living separately) of a married couple, or lovers / dates / boyfrend + girlfrend breaking up; is that true?
分手 is for break up relationship 离婚 is divorce.