if she really cared for him or her really cared for her it wouldnt have been broken off on such hostile terms
u joking? if you've been dating someone for like...... idk, guessing at least a year or so, and then they start getting close to some other guy. you know what they're doing. you'd literally have to be blind not to. but they pretend to hide it anyway. it's really remarkable that he was calm through all of that. and then, they break up with you for this person? are you really going to say you'd be docile in his place?
I personally would not let the girl continue to live with me in his place. I might pay for a hotel or something for a couple of days until they can figure something else out, but I'm not gonna let someone who cheated on me for months, even going as far as to do it
in my house, keep living with me. it just isn't going to happen. it is nobody's fault but the girl's and XR's that he is upset. he can't even be blamed. his reaction is exactly what would be expected of anyone else. for that matter, he is acting
less upset than I'd expect someone else in his position to