Diseases people have that should be recognized by doctors.

I agree on everything except the RTV. I would like to claim that those around a good couple have the common illness known as jealousy, be it because they miss their friend or just hate to see others happy. Hell, a good match between boy and girl is hard to break. She/he is your best friend, you share common interests and passions, and above all you can have sex in between doing stuff that you both find fun. Granted it can be balanced well with having other friends, anyone thinking that "bros before hoes" is a truth, they have clearly never had a good relationship that could last the first year of new and exciting. Piss on friends that cannot accept that your partner is important enough to not hang out at the pub every single day for.