I know you let only that one speculation on Ben's sexuality go through, but i just want to share my opinion why he at least didn't pick someone he's friend with. Because he is decent man. do you really think he would ask an actual FRIEND of him to give up on love, romance and dating only for his career? that would be awful. But being in fake relationship with person he doesn't care for (and who doesn't care for him) is way easier. It's only business, no feelings involved.