My opinion of their relationship is that it is produced.
Meaning they were just friends before the show but that
was too boring of a relationship for TV, so they became "newly
dating."

I guess I should explain my reasoning for this theory. When
the promos came out for this show and I saw that this pair
came from the same city as I, I spoke to a triathlon coach,
who knew the couple, about the coincidence. When I asked
about their relationship (this was before the show began,)
she said that as far as she knew they were just good friends
and had a bond due to the fact that he made her prosthetic leg.
I think the producers are asking her to comment as if she is
considering a serious relationship with him. The way I view her
melt down is part frustration because she is a competitor, and
part, "why the hell am I having to deal with this guy as if
he is my boyfriend, when clearly, he's not!"

The clap on, clap off habit of Peter would definitely cause
me to knock his lights out.