I’ll keep the house
We live in a society where most people meet their partners online rather than in person, and Dr. Who girl ticked all of Greg’s boxes, as he met her on an online dating site.
He was able to look into the future and realize that he needed to break up with her, even though she appeared to be everything. After all, he couldn’t go through another divorce. He should have struck while the iron was hot and kept the house in Hawaii.