Ok don't get me wrong I love this manga fo much I read it so many times
but is it just me or is this kind of weird how they become a couple..?

Ok don't get me wrong I love this manga fo much I read it so many times

they're both happy in the end and i'm also happy for them so it's fine ig 
Yup! It is weird! If the Manga was longer than that, it could have been a little more structured and kind of "logical" or at least plausible or convincing, but it seems like a bad patchwork now. He may have presented the whole thing like broken pieces mending together, but you need a good glue and technique to do that, and there wasn't such things here