I've seen people celebrate 6 months anniversary but that is when they are in their teenagers barely in high-school.
Seldom see over the top 30 something celebrating it, unless you are a celeb in on of those relationship for publicity Hollywood and you need all the promo you can get.
Maybe seeing her friend Mew very happy with her Hi-So made her want to rush to the altar?
Ter actually compliment Mai a lot, he is funny and calm to balance out Mai chirpy self. He is actually looking better too. They are open and very relax with it, Ter doesn't try to overshadow or try to put himself in the limelight with any of Mai work, he just carry on in the background and let her do her thing.