Little by little, I have been teaching my boyfriend sign language (finger spelling and ASL).
He has been doing a wonderful job so far!
Sign language is useful for when we need to talk privately, when we can't talk or use our voices, or when we just want to communicate with each other from across a room or distance. The other day, we were sitting outside the apartment under my neighbor's window which happened to be open. We were able to have a full discussion, silently, even though it took a while as my boyfriend struggled to finger-spell and remember certain signs.
I will sometimes sign when I am so mad that I don't want to speak. He thinks it is cute when I do this, which infuriates me even more.
He often uses it when I have trouble hearing him. He doesn't have to yell or repeat himself again and again trying not to get mad.
It is especially nice when we want to be romantic or sweet without using any words. I like it when he makes an 'E' hand shape and put it over his heart and smile.
I would say that sign language adds to the relationship and has brought us even closer.