I think in my hen's case, the roo was the first one to be nice to her when she was introduced to the flock. I introduced her friend at the same time but it wasn't long before she started ignoring her friend and loving the roo. She was the first to accept his advances so I can understand him liking her best LOL. But now, she can accept or refuse and he's fine with it. It's so cute to watch her gently groom his head. He lays there and closes his eyes when she does that.
I think so. One of my roosters has a favorite hen, they are always together, and if one of the other hens tries to get close to him Libby puts the other hen in her place with a swift peck on the head. Last night I went into the coop to check one them as I always do and he had his head tucked under her wing.
Sure why not. Lots of birds mate for life it seems completely likely that chickens would too. Who know how they would behave out in the wild without our interference. While the following article doesn't mention this I have heard over and over that Mourning Doves mate for life.
In spring I bought 13 mixed chicks. It turned out a got a bantam lavender cochin male and female. These two chicks stayed together constantly. I needed to give away some of my chickens and this pair was given away to an extremely small flock- 6 chickens in total! And they are still together constantly. I feel they are bonded soul mates. Crazy, but it is a nice thought.
I have an impossible love story going on in my coop... My smallest pullet, a Hamburg, fell in love with my huge Brahma roo. Luckily he fell in love with the Brahma pullet and the other big girls... but this Hamburg follows him everywhere, it is pitiful!