@NinjaGoemon not really. A more accurate description would be that some of the girls were hetero from the very beginning, and the lesbian girls who were in love with them had to give up on their love.
@Korath and that, my friend, is what the axe does... Completely agree with you, it's a shame really. I like how the author had the guts to not only make some of the ships sink (for the two girls who kinda had a thing for each other but never admitted it, and ended up marrying a guy at the end), but also some of the ships never sail. It's also refreshing to have some of the love interests being hetero in a yuri manga tbh, it adds a form of drama that is rarely exploited by the authors ("I have to give up on my love because I know it will never be returned") and add a bit of depth to the characters. So I really liked where the author was taking his story, I just find it too bad that he had to rush the ending like this.