@rrolo1
I don't know what your standards are but this is a pretty good pace for relationships to develop, especially for a manga. At least when read in sequence and not serially.
It's only been like two and a half years in story, most of the first year he was severely depressed, the second year he figured out what he wanted, and now he's actualizing it - and if he had his way he would have already proposed a while ago.
I just read it all in one go and the pace is actually refreshing compared to most other long running romance/drama stories I can think of. I could show you some TRULY glacial, out-and-out stalling from authors over relationship development.