@SlimeC0RE - I'll try to make a more step-by-step explanation.
Talking about love affairs is embarrassing. You're going to get all red as a result. You don't want other people to see you lose composure and become all red. So you talk in the darkness, where other people don't see your face.
Myself I'm a simpler person, so I don't want to talk about love in the first place. But I'm not a teenage girl (and I don't remember ever being one).
What I meant, @flannan, was not that I don’t understand that talking about love is embarrassing, but that I don’t understand why talking about love is embarrassing.
And besides, feelings come across more easily when you can see each others’ faces (though that seems to actually be the point).