Please don't do this

When the gal whom a guy thinks he loves, drops a bomb by saying
‘I am getting/got betrothed’
Poor guy…Shell shocked .…Million transformers must have burst in his tiny heart, he still sports a smile n tries to show that he’s at ease by dropping a line of humor.
‘Cool!!! Who is that un(?)lucky guy???’. What else can he do?
His worst nightmare is the thing that happens most often. She wouldn’t have given him the slightest of hunch that she has a boy friend and yet one dinner she invites him and gives an intro, ‘This is my fiancee…’