I never really thought about the portal in HL2 much, because I just thought of it as a reason for breen to escape, because that’s what most bad guys in games do in games/movies.
Looking into it reveals several Combine themed towers (dark dirty metal with blue lights and sharp parts) in a space like environment similar to that of Xen’s.
I think Breen has made use of portals and Xen and created some kind of personal civilization there
, that might be where that boyfriend advisor of his might live.
What do you think?