These are all complex theories about the whole chad situation:
1) Chad is gay and banging someone related to Melanie (brother?);
2) Chad is not gay and is banging someone related to Melanie (sister or mother, maybe she's the daughter of a teacher);
3) Chad is transitioning to women, so he can participate in competitions as a woman and easily win them, he's into a futa girl (Mel's sister, not yet revealed);
4) Chad is schizophrenic and on the phone, he talks to his imaginary girlfriend. Mel knows about his mental problems.
(last one is my favourite of em all

)
hypothesis by
Gunizz